CN106769938A - A kind of total nitrogen in-line analyzer and its detection method - Google Patents
A kind of total nitrogen in-line analyzer and its detection method Download PDFInfo
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- CN106769938A CN106769938A CN201611255097.6A CN201611255097A CN106769938A CN 106769938 A CN106769938 A CN 106769938A CN 201611255097 A CN201611255097 A CN 201611255097A CN 106769938 A CN106769938 A CN 106769938A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 61
- 238000001514 detection method Methods 0.000 title claims abstract description 60
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 67
- 238000005259 measurement Methods 0.000 claims abstract description 51
- 230000029087 digestion Effects 0.000 claims abstract description 43
- 230000002572 peristaltic effect Effects 0.000 claims abstract description 41
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 239000002699 waste material Substances 0.000 claims abstract description 25
- 238000005070 sampling Methods 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 30
- 230000003287 optical effect Effects 0.000 claims description 28
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 17
- 235000019394 potassium persulphate Nutrition 0.000 claims description 16
- 239000000835 fiber Substances 0.000 claims description 15
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 13
- 238000002835 absorbance Methods 0.000 claims description 13
- 229910052710 silicon Inorganic materials 0.000 claims description 13
- 239000010703 silicon Substances 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 12
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 claims description 9
- 229910052805 deuterium Inorganic materials 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000003750 conditioning effect Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 238000010790 dilution Methods 0.000 claims description 3
- 239000012895 dilution Substances 0.000 claims description 3
- 230000003993 interaction Effects 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 4
- 239000005416 organic matter Substances 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 18
- 239000005446 dissolved organic matter Substances 0.000 description 9
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 6
- 102000012286 Chitinases Human genes 0.000 description 5
- 108010022172 Chitinases Proteins 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 238000012937 correction Methods 0.000 description 5
- 229910002651 NO3 Inorganic materials 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 206010016766 flatulence Diseases 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 125000001477 organic nitrogen group Chemical group 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 150000004968 peroxymonosulfuric acids Chemical class 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 238000002798 spectrophotometry method Methods 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 238000004737 colorimetric analysis Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000010808 liquid waste Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- LFLZOWIFJOBEPN-UHFFFAOYSA-N nitrate, nitrate Chemical compound O[N+]([O-])=O.O[N+]([O-])=O LFLZOWIFJOBEPN-UHFFFAOYSA-N 0.000 description 1
- 150000002829 nitrogen Chemical class 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005375 photometry Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- -1 two Optical filter Substances 0.000 description 1
- 238000004457 water analysis Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
- G01N21/09—Cuvette constructions adapted to resist hostile environments or corrosive or abrasive materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N2021/3129—Determining multicomponents by multiwavelength light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/061—Sources
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
Abstract
The present invention relates to a kind of total nitrogen in-line analyzer and its detection method, including peristaltic pump, metering module, multiple-way valve, high temperature high pressure valve, detection module, the High-temperature Digestion module for providing sampling power being connected by pipeline.Peristaltic pump is communicated by pipeline with metering module, the upper end of metering module communicates with peristaltic pump, lower end communicates with multiple-way valve, multiple-way valve is communicated by the water sample in the public pipeline of different pipelines and metering module, High-temperature Digestion module, detection module and agent bin, amount mark, zero standard, waste liquid and at least one reagent cartridge, the upper and lower ends of High-temperature Digestion module are respectively arranged with high temperature high pressure valve, lower end communicates with multiple-way valve, and upper end communicates with air.Entirety compact of the invention, simple structure, light path design can exclude the interference of organic matter, and seldom, treatment cost of waste liquor is low, reagent long shelf-life for water sample and reagent dosage, and measurement is accurate, detects ambient stable.
Description
Technical field
It is online more particularly, to a kind of total nitrogen the present invention relates to the water quality on-line monitoring instrument in online environment monitoring field
Analyzer and its detection method.
Background technology
Total nitrogen is the summation of the inorganic nitrogen such as ammonia nitrogen, nitrate nitrogen, nitrite nitrogen and organic nitrogen in water body.Lake, reservoir
In containing exceeded nitrogen class material when, can cause phytoplankton breed it is luxuriant, there is eutrophication；Promote biological and microbiology class
Quickening breeding, cause oxygen in water to reduce, water quality deteriorates rapidly.Some nitrogen-containing compounds are toxic to people and other biological
Effect.Total nitrogen is one of important indicator of the measurement contaminated degree of water body and Eutrophic Extent, total nitrogen in Accurate Determining water body
Content is significant.
At present in water analysis, the measure of total nitrogen generally uses potassium persulfate oxidation, makes organic nitrogen and inorganic nitrification
After thing is changed into nitrate, then surveyed with ultraviolet method, azo colorimetric method and the chromatography of ions and gas molecule in space absorption process
It is fixed.
The method most often selected is national standard analysis method《The measure alkaline chitinase of water quality total nitrogen clears up ultraviolet point
Light photometry》(HJ 636—2012).Compared with other methods, the method has that operating procedure is simple, reagent is few, instrument and equipment
Few the advantages of.Meanwhile, in actual sample continuous mode, the method has the disadvantage that：Digestion time is long；Operating process is present
Certain risk；It is required that experimental water, reagent, glassware and surrounding environment are required very blank value without ammonia pollution
It is strict etc..The total nitrogen of measure is easily affected by various factors and measurement result deviation is occurred.
At present, total nitrogen water quality on-line monitoring instrument table is mainly used《The measure alkaline chitinase of water quality total nitrogen is cleared up ultraviolet
AAS》(HJ 636—2012).The deficiency that existing total nitrogen online monitoring instrument is primarily present is as follows：
1. use xenon lamp as light source, the absorbance of total nitrogen determined using 220nm wavelength, 275nm wavelength is not used, it is impossible to
Eliminate the interference that dissolved organic matter brings.Compared with national standard method, measured value is bigger than normal.
2. water sample and reagent dosage are big, and then cause waste liquid amount big, increased the workload and waste liquid of operation and maintenance personnel
Processing cost.
3. the alkaline chitinase solution shelf-life for being used as oxidant is short, it is necessary to often change.
4. the degree of accuracy and stability is not good enough, it is impossible to meets the requirement for determining low concentration sample.
The content of the invention
Above-mentioned deficiency of the present invention for existing total nitrogen in-line analyzer, there is provided a kind of based on the whole of national standard method
Body compact structure, light path are succinct efficiently, water sample and reagent dosage is few, reagent long shelf-life, the degree of accuracy and stability total nitrogen high
In-line analyzer and its detection method, the present invention exist suitable for water quality such as surface water, underground water, industrial wastewater and sanitary sewages
Line is monitored.
The present invention relates to a kind of total nitrogen in-line analyzer, including by pipeline be connected for provide sampling power it is compacted
Dynamic pump, metering module, at least one valve, detection module, the valve include multiple-way valve, the HTHP for pipeline switching
Valve, the total nitrogen in-line analyzer also includes High-temperature Digestion module and the water sample, amount mark, zero standard, the waste liquid that are connected with multiple-way valve
With at least one reagent cartridge, the peristaltic pump communicated by pipeline with metering module, the upper end of the metering module with wriggle
Pump is communicated, and lower end communicates with multiple-way valve, and the multiple-way valve is by different pipelines and public pipeline, the High-temperature Digestion of metering module
Water sample, amount mark, zero standard, waste liquid and at least one reagent cartridge in module, detection module and agent bin are communicated, and the high temperature disappears
The upper and lower ends for solving module are respectively arranged with high temperature high pressure valve, and lower end communicates with multiple-way valve, and upper end communicates with air；Its feature exists
In：The detection module includes deuterium lamp, lens group, single beam fibre, biconvex lens, colorimetric pool, planoconvex spotlight, bifurcation fiber, two
Optical filter, silicon photocell are planted, the component is linked in sequence successively, constitute complete detection light path, wherein, two kinds of optical filters are put respectively
It is corresponding with silicon photocell in two signal output heads of bifurcation fiber.
Preferably, the total nitrogen in-line analyzer also includes the control system of each module operation of control, with based on ARM kernels
Control chip as main control unit, and embedded real time operating system creates multiple operation tasks：
Task one：It is responsible for controlling pump, photoelectric metering, multiple-way valve, heating, temperature detection, detection functional module of opening the door, and leads to
High-precision AD conversion chip collection photosignal data are crossed, measurement result is calculated using integral algorithm and standard curve；
Task two：It is responsible for carrying out real-time communication with display panel module, and the information such as measurement result and measuring state is uploaded
Storage is carried out to display screen to show；
Task three：It is responsible for receiving remote operation and upgrade command, and externally transmission measurement result；
Task four：It is responsible for receiving the configuration-direct of display screen, carries out the instruction interaction of control system and display.
Preferably, the length, width and height of the total nitrogen in-line analyzer are respectively 37cm, 25cm, 54cm, and volume is 0.05m3.
Preferably, the optical filter is optical filter respectively by 220nm wavelength and 275nm wavelength, using 220nm and
275nm double UV checks, calculate correction absorbance, exclude the interference that brings of dissolved organic matter, and only with 220nm wavelength
Similar instrument is compared, more accurate for water determination；Potassium peroxydisulfate has the ammonia nitrogen in water sample, nitrite nitrogen and major part
Machine nitrogen compound is oxidized to nitrate, nitrate ion have absorption maximum at 220nm wavelength but dissolved organic matter herein
Locate also have absorption, interference measurement, at 275nm wavelength, nitrate ion does not absorb only dissolved organic matter absorption, institute
With the mensuration absorbance at 275nm, can be used for correcting nitrate values of nitrogen might, exclude the interference that dissolved organic matter brings.
Preferably, the minimum measurement unit of the metering module is 0.5ml, and highest measurement unit is 2ml.
The invention further relates to a kind of detection method of above-mentioned total nitrogen in-line analyzer, including measurement process and calibration process.
Preferably, the detection module operation principle is：Deuterium lamp sends ultraviolet light as light source, by lens group optically focused
Afterwards, transmitted to biconvex lens by single beam fibre, ultraviolet light is by after biconvex lens optically focused, through colorimetric pool, part is ultraviolet
Light is absorbed by the water sample in colorimetric pool, and transmitted light by bifurcation fiber by after planoconvex spotlight optically focused, being transferred to optical filter, thoroughly
Light is penetrated by optical filter, the signal of other wavelength is filtered out, retain target detection wavelength signals, reach silicon photocell, silicon light
Optical signal is converted to electric signal by battery, then is entered into high-precision AD conversion chip by signal conditioning circuit and carried out modulus and turn
It is changed to data signal to be processed, the raw digital signal of measured value and reference value is by smothing filtering algorithm and integral algorithm meter
Measurement absorbance is calculated, then measurement concentration is calculated by standard curve algorithm.
Preferably, by the metering module, the total nitrogen in water sample is often measured once, required reagent potassium peroxydisulfate volume
It is 1ml, the volume of NaOH and hydrochloric acid is 0.5ml, and 2mL reagents, 8ml water samples are needed altogether, compared with prior art, tool
There is few reagent dosage and waste liquid discharging amount, substantially reduce devil liquor recovery processing cost and attendant's workload.
Preferably, the reagent potassium peroxydisulfate, NaOH are separately deposited, and independently enter reagent during measurement successively, reagent
Shelf-life is more than 2 months；《The measure alkaline chitinase of water quality total nitrogen clears up ultraviolet spectrophotometry》(HJ 636—2012)
Manner of formulation be mixed into a kind of reagent for potassium peroxydisulfate and NaOH, the shelf-life is one week, is the reason for possible, persulfuric acid
Potassium and NaOH mixed storage, the failure for accelerating potassium peroxydisulfate are gone bad, and reduce oxidability；The present invention uses persulfuric acid
Potassium and NaOH separately deposits, independently enter the mode of reagent successively, significantly the extension reagent shelf-life.
Preferably, using 3 automatic Calibrations, binomial data fitting, based on mass data test analysis, in range model
In enclosing, the standard liquid for choosing optium concentration is marked as amount, instrument automatic dilution to aimed concn, the error of indication of measurement result
Within ± 5%, meet《Total nitrogen water quality automatic analyzer technical requirements》(HJ/T102-2003) requirement.
Preferably, High-temperature Digestion pond of the present invention and colorimetric pool are separate, and water sample to be measured is cleared up instead in High-temperature Digestion pond
After should finishing and being cooled to 45 DEG C, measurement in colorimetric pool is transferred to；High-temperature Digestion pond of the present invention is using corrosion-resistant, resistant to elevated temperatures
Quartz glass tube, colorimetric pool uses the quartz circulation cuvette with good optical permeability, with common High-temperature Digestion pond and ratio
Color pond unitary design is compared, and the present invention can avoid thermokalite contrastive colours pond from corroding the detection error brought, there is provided stable, effective
Detection environment.
The beneficial effects of the invention are as follows：Overall compact, simple structure；The ingenious novelty of light path design, is made using deuterium lamp
It is light source, Optical Fiber Transmission, double UV check, the interference of organic matter can be excluded；Water sample and reagent dosage seldom, liquid waste processing into
This is low；By the way of potassium peroxydisulfate and NaOH are separately deposited, independently enter reagent successively, significantly extend the reagent shelf-life；
Using 3 automatic Calibrations, the fitting of binomial data, measurement is accurate；High-temperature Digestion pond and colorimetric pool split are designed, and can be provided
Stablize, effectively detect environment.
Brief description of the drawings
Fig. 1 is a kind of structural representation of total nitrogen in-line analyzer of the invention；
Fig. 2 is a kind of light path schematic diagram of total nitrogen in-line analyzer of the invention；
Fig. 3 is a kind of flow chart of the detection method of total nitrogen in-line analyzer of the invention.
Specific embodiment
Specific embodiment of the invention is further detailed below in conjunction with accompanying drawing.
Fig. 1 is refer to, it is a kind of structural representation of total nitrogen in-line analyzer of the invention, a kind of total nitrogen of the invention is online
Analyzer entirety compact, using flat display interactive interface, using control system control operation task.The control system
System creates multiple operation tasks using the control chip based on ARM kernels as main control unit, and embedded real time operating system：
Task one：It is responsible for controlling pump, photoelectric metering, multiple-way valve, heating, temperature detection, detection functional module of opening the door, and leads to
High-precision AD conversion chip collection photosignal data are crossed, measurement result is calculated using integral algorithm and standard curve；
Task two：It is responsible for carrying out real-time communication with display panel module, and the information such as measurement result and measuring state is uploaded
Storage is carried out to display screen to show；
Task three：It is responsible for receiving remote operation and upgrade command, and externally transmission measurement result；
Task four：It is responsible for receiving the configuration-direct of display screen, carries out the instruction interaction of control system and display.
Total nitrogen in-line analyzer mainly includes being used for the peristaltic pump 1 of offer sampling power, metering module 2, is cut for pipeline
The multiple-way valve 5 that changes, High-temperature Digestion module 4, detection module 6, high temperature high pressure valve 3 and the water sample pipeline being connected with multiple-way valve 5
504th, amount mark pipeline 505, zero standard pipeline 506, waste-solution line 507 and reagent A pipeline 501, reagent B pipelines 502, reagent C pipeline
503.The peristaltic pump 1 is communicated by pipeline with metering module 2, and the upper end of the metering module 2 communicates with peristaltic pump 1, lower end
Communicated with multiple-way valve 5.The multiple-way valve 5 is by different pipelines and public pipeline 510, the High-temperature Digestion module of metering module 2
4th, detection module 6 is communicated, and by pipeline 501-507 respectively with agent bin in reagent A, B, C portion 511-513, water sample portion
514th, amount mark portion 515, zero standard portion 516, waste collection bucket 517 is communicated.The upper and lower ends of the High-temperature Digestion module 4 respectively have one
High temperature high pressure valve 3, lower end communicates with multiple-way valve 5, and upper end communicates with air.
Fig. 2 is refer to, it is a kind of light path schematic diagram of total nitrogen in-line analyzer of the invention, wherein the detection module 6
Including deuterium lamp 7, lens group 8, single beam fibre 9, biconvex lens 10, colorimetric pool 11, planoconvex spotlight 12, bifurcation fiber 13, optical filter
A14, optical filter B15, silicon photocell 16.Deuterium lamp 7 sends ultraviolet light as light source, by after the optically focused of lens group 8, by single beam
Optical fiber 9 is transmitted to biconvex lens 10, ultraviolet light by after the optically focused of biconvex lens 10, through colorimetric pool 11.Part ultraviolet light
Absorbed by the water sample in colorimetric pool 11, transmitted light is by after the optically focused of planoconvex spotlight 12, optical filter A being transferred to by bifurcation fiber 13
14 and optical filter B 15.Transmitted light filters out the signal of other wavelength by optical filter, retains target detection wavelength signals,
Reach silicon photocell 16.Silicon photocell 16 converts optical signals to electric signal, then enters into high accuracy by signal conditioning circuit
AD conversion chip carry out analog-to-digital conversion for data signal is processed.The raw digital signal of measured value and reference value is by flat
Sliding filtering algorithm and integral algorithm calculate measurement absorbance, then calculate measurement concentration by standard curve algorithm.
A kind of application method of total nitrogen in-line analyzer of the present invention includes measurement process and calibration process.Fig. 3 is refer to, its
It is a kind of flow chart of the measurement process of total nitrogen in-line analyzer of the invention.Measurement process described in detail below and calibration process：
1. measurement process
1.1 rinses：Multiple-way valve 5 switches to water sample pipeline 504, while counterclockwise for providing the peristaltic pump 1 of sampling power
Rotation, water sample is promoted in the gauge line in metering module 2, and the photoelectric detection system in metering module 2 is by detecting liquid level
Change, controls the rotation of peristaltic pump 1, realizes the accurate measurement of volume of water sample.After water sample metering is finished, multiple-way valve 5 switches to useless
Liquid pipeline 507, peristaltic pump 1 turns clockwise, by water sample from the gauge line discharge in metering module 2, by multiple-way valve 5, waste liquid
Pipeline 507 is emitted into waste collection bucket 517.Rinse operation is completed, the process is repeated, the operation of rinse twice is completed.
1.2 sample introductions：Multiple-way valve 5 switches to water sample pipeline 504, while counterclockwise for providing the peristaltic pump 1 of sampling power
Rotation, water sample is promoted in the gauge line in metering module 2, and the photoelectric detection system in metering module 2 is by detecting liquid level
Change, controls the rotation of peristaltic pump 1, realizes the accurate measurement of volume of water sample.After water sample metering is finished, multiple-way valve 5 switches paramount
Temperature clears up the pipeline 509 of module 4, meanwhile, the high temperature high pressure valve 3 for clearing up the two ends of module 4 is opened, and peristaltic pump 1 turns clockwise, by water
Sample is pushed to and clears up mould from the gauge line in metering module 2 by multiple-way valve 5, the high temperature high pressure valve 3 for clearing up the lower end of module 4
In digestion tube in block 4.After push water sample is finished, the high temperature high pressure valve 3 at the two ends of module 4 is cleared up in closing.The process is repeated, until
Volume of water sample reaches sets requirement.
1.3 enter reagent A：Multiple-way valve 5 switches to reagent A pipeline (potassium peroxydisulfate) 501, while for providing sampling power
The rotate counterclockwise of peristaltic pump 1, reagent A is promoted in the gauge line in metering module 2, the Photoelectric Detection dress in metering module 2
Put by detecting that liquid level changes, control the rotation of peristaltic pump 1, realize accurate measurement reagent A volume 1ml.Reagent A metering is finished
Afterwards, multiple-way valve 5 is switched to and clears up the pipeline 509 of module 4, meanwhile, the high temperature high pressure valve 3 for clearing up the two ends of module 4 is opened, peristaltic pump 1
Turn clockwise, by reagent A from the gauge line in metering module 2, by multiple-way valve 5, clear up the HTHP of the lower end of module 4
Valve 3 is pushed in the digestion tube cleared up in module 4.After push reagent is finished, peristaltic pump 1 continues to turn clockwise 20 seconds, by sky
Tympanites enters to clear up in the digestion tube in module 4, realizes the uniform mixing of reagent and water sample.The high temperature at the two ends of module 4 is cleared up in closing
High pressure valve 3.
1.4 enter reagent B：Multiple-way valve 5 switches to reagent B pipelines (NaOH) 502, while for providing sampling power
The rotate counterclockwise of peristaltic pump 1, reagent B is promoted in the gauge line in metering module 2, the Photoelectric Detection dress in metering module 2
Put by detecting that liquid level changes, control the rotation of peristaltic pump 1, realize accurate measurement reagent B volumes 0.5ml.Reagent B meterings are finished
Afterwards, multiple-way valve 5 is switched to and clears up the pipeline 509 of module 4, meanwhile, the high temperature high pressure valve 3 for clearing up the two ends of module 4 is opened, peristaltic pump 1
Turn clockwise, by reagent B from the gauge line in metering module 2, by multiple-way valve 5, clear up the HTHP of the lower end of module 4
Valve 3 is pushed in the digestion tube cleared up in module 4.After push reagent is finished, peristaltic pump 1 continues to turn clockwise 20 seconds, by sky
Tympanites enters to clear up in the digestion tube in module 4, realizes the uniform mixing of reagent and water sample.The high temperature at the two ends of module 4 is cleared up in closing
High pressure valve 3.
1.5 High-temperature Digestions：Clear up the heating wire in module 4 and begin to warm up intensification, the temperature of digestion tube is heated to 122 DEG C
Afterwards, constant temperature 10 minutes, High-temperature Digestion is carried out to the water sample in digestion tube.Clear up after finishing, the cooling fan cleared up in module is opened
Begin to rotate, when the temperature for clearing up module is reduced to 50 DEG C, cooling stops.
1.6 enter reagent C：Multiple-way valve 5 switches to reagent C pipeline (hydrochloric acid) 503, while the wriggling for providing sampling power
The rotate counterclockwise of pump 1, reagent C is promoted in the gauge line in metering module 2, and the photoelectric detection system in metering module 2 leads to
The change of detection liquid level is crossed, the rotation of peristaltic pump 1 is controlled, accurate measurement reagent C volume 0.5ml is realized.After reagent C metering is finished,
Multiple-way valve 5 is switched to clears up the pipeline 509 of module 4, meanwhile, the high temperature high pressure valve 3 for clearing up the two ends of module 4 is opened, the up time of peristaltic pump 1
Pin rotates, and by reagent C from the gauge line in metering module 2, by multiple-way valve 5, clears up the high temperature high pressure valve 3 of the lower end of module 4
In pushing to the digestion tube cleared up in module 4.After push reagent is finished, peristaltic pump 1 continues to turn clockwise 20 seconds, and air is roused
Enter to clear up in the digestion tube in module 4, realize the uniform mixing of reagent and water sample.The HTHP at the two ends of module 4 is cleared up in closing
Valve 3.
1.7 rinse colorimetric pools：Multiple-way valve 5 switches to the pipeline 509 of High-temperature Digestion module 4, while high temperature high pressure valve 3 is opened,
The rotate counterclockwise of peristaltic pump 1, the public pipeline 510 that detection water sample passes through bottom high temperature high pressure valve 3, multiple-way valve 5 and metering module 2
Gauge line into metering module 2, after being promoted to setting liquid level, multiple-way valve 5 switches to the colorimetric pool pipeline in detection module 6
508, peristaltic pump 1 turns clockwise, and by water sample from the gauge line discharge in metering module 2, by multiple-way valve 5, is advanced into detection
In colorimetric pool in module 6.
Then, multiple-way valve 5 continues to switch to the colorimetric pool pipeline 508 in detection module 6, and the rotate counterclockwise of peristaltic pump 1 will
Water sample is extracted out from the colorimetric pool in detection module 6, and metering mould is entered by the public pipeline 510 of multiple-way valve 5 and metering module 2
Gauge line in block 2, after being promoted to setting liquid level, multiple-way valve 5 switches to waste-solution line 507, and peristaltic pump 1 turns clockwise, will
Waste liquid, by multiple-way valve 5, waste-solution line 507, is emitted into waste collection bucket 517 from the gauge line discharge in metering module 2.
Repeat above-mentioned rinse colorimetric pool process twice, then water sample to be measured is imported into colorimetric by third time according to above-mentioned steps
Chi Zhong, prepares detection.
1.8 detections：The light source deuterium lamp 7 of detection module opens preheating while reagent C is entered.After light source state is stable,
Deuterium lamp 7 sends ultraviolet light as light source, purple by after the optically focused of lens group 8, being transmitted to biconvex lens 10 by single beam fibre 9
UV light by after the optically focused of biconvex lens 10, through colorimetric pool 11.Part ultraviolet light is absorbed by the water sample in colorimetric pool 11, thoroughly
Light is penetrated by after the optically focused of planoconvex spotlight 12, optical filter A14 and optical filter B15 being transferred to by bifurcation fiber 13.Transmitted light is passed through
Optical filter, the signal of other wavelength is filtered out, and retains target detection wavelength signals, reaches silicon photocell 16.Silicon photocell 16
Optical signal is converted to electric signal, then high-precision AD conversion chip is entered into by signal conditioning circuit is carried out analog-to-digital conversion and be
Data signal is processed.Raw digital signal calculates measurement absorbance by smothing filtering algorithm and integral algorithm,
1.9 emptyings：After detection is finished, multiple-way valve 5 switches to the colorimetric pool pipeline 508 in detection module 6, and peristaltic pump 1 is inverse
Hour hands rotate, and detection waste liquid are extracted out from the colorimetric pool in detection module 6, by multiple-way valve 5 and the public pipe of metering module 2
The gauge line that road 510 enters in metering module 2, after being promoted to setting liquid level, multiple-way valve 5 switches to waste-solution line 507, peristaltic pump
1 turns clockwise, and waste liquid from the gauge line discharge in metering module 2 will be detected, by multiple-way valve 5, waste-solution line 507, discharge
To waste collection bucket 517.
After detection waste liquid emptying in colorimetric pool in detection module 6, multiple-way valve 5 switches to the pipeline of High-temperature Digestion module 4
509, while high temperature high pressure valve 3 is opened, the rotate counterclockwise of peristaltic pump 1, detection waste liquid passes through bottom high temperature high pressure valve 3, multiple-way valve 5
The gauge line entered in metering module 2 with the public pipeline 510 of metering module 2, after being promoted to setting liquid level, multiple-way valve 5 switches
To waste-solution line 507, peristaltic pump 1 turns clockwise, by waste liquid from metering module 2 gauge line discharge, by multiple-way valve 5,
Waste-solution line 507, is emitted into waste collection bucket 517.The process is repeated, until waste liquid is from clearing up in High-temperature Digestion module 4
Untill being emptied in pipe.
1.10 cleanings：Multiple-way valve 5 switches to zero standard pipeline 506, while the rotate counterclockwise of peristaltic pump 1, zero standard is promoted to
In gauge line in metering module 2, the photoelectric detection system in metering module 2 is changed by detecting liquid level, control peristaltic pump 1
Rotate, zero standard is promoted to setting liquid level.After zero standard metering is finished, multiple-way valve 5 switches to the pipeline 509 of High-temperature Digestion module 4, together
When the two ends of High-temperature Digestion module 4 high temperature high pressure valve 3 open, peristaltic pump 1 turns clockwise, by zero standard from metering module 2
In gauge line, disappearing in High-temperature Digestion module 4 is pushed to by the high temperature high pressure valve 3 of multiple-way valve 5, the lower end of High-temperature Digestion module 4
Xie Guanli.Push after zero standard finishes, peristaltic pump continues to turn clockwise 20 seconds, air is blasted into disappearing in High-temperature Digestion module 4
The cleaning of tube wall is cleared up in Xie Guanli, promotion, is then shut off high temperature high pressure valve 3.The process is repeated, until the liquid level of zero standard water is high
The liquid level of mixing liquid after reagent C is added.
Then, multiple-way valve 5 switches to the pipeline 509 of High-temperature Digestion module 4, while high temperature high pressure valve 3 is opened, peristaltic pump 1 is inverse
Hour hands rotate, and zero standard enters metering module 2 by the public pipeline 510 of bottom high temperature high pressure valve 3, multiple-way valve 5 and metering module 2
In gauge line, be promoted to setting liquid level after, multiple-way valve 5 switches to the colorimetric pool pipeline 508 in detection module 6, and peristaltic pump 1 is suitable
Hour hands rotate, and by zero standard from the gauge line discharge in metering module 2, by multiple-way valve 5, are advanced into the colorimetric in detection module 6
Chi Zhong.
Then, operated by above-mentioned emptying, by cleaning waste liquid discharge.A cleaning operation is completed, the process is repeated, completed
Cleaning operation twice.
1.11 measurement reference values：In second cleaning operation, the liquid level in colorimetric pool of the zero standard in detection module 6
When reaching detection liquid level, the absorption signal of zero standard is detected at 220nm and 275nm wavelength, as reference value.
1.12 calculate：The automatic computation and measurement value of instrument and reference value, draw at 220nm the and 275nm wavelength of this measurement
Absorbance, according to formula A=A220-2A275 calculate correction absorbance A, total nitrogen (in terms of N) content with correction absorbance A into
Direct ratio.The correction absorbance is calculated according to the standard curve that instrument is stored, the concentration value of this measurement is drawn.
2. calibration process：
Instrument automatic Calibration, rinse and automatically switches to when entering water sample from zero standard pipeline 506 and extracts zero standard (Zero calibration)
The extracted amount mark of pipeline 505 is marked with from amount (amount mark is demarcated).Other flows are consistent with measurement process.
In the above-described embodiment, the length, width and height of the total nitrogen in-line analyzer are respectively 37cm, 25cm, 54cm, volume
It is 0.05m3.The optical filter is optical filter respectively by 220nm wavelength and 275nm wavelength, double using 220nm and 275nm
Wavelength detecting, calculates correction absorbance, the interference that dissolved organic matter brings is excluded, with the similar instrument only with 220nm wavelength
Table is compared, more accurate for water determination；Potassium peroxydisulfate is by the ammonia nitrogen in water sample, nitrite nitrogen and most of organic nitridation
Compound is oxidized to nitrate, and nitrate ion has absorption maximum at 220nm wavelength but dissolved organic matter also has herein
Absorb, interference measurement, at 275nm wavelength, nitrate ion does not absorb only dissolved organic matter absorption, so
Mensuration absorbance at 275nm, can be used for correcting nitrate values of nitrogen might, exclude the interference that dissolved organic matter brings.The metering
The minimum measurement unit of module 2 is 0.5ml, and highest measurement unit is 2ml.By the metering module 2, the total nitrogen in water sample is every
Once, required reagent potassium peroxydisulfate volume is 1ml for measurement, and the volume of NaOH and hydrochloric acid is 0.5ml, needs altogether
2mL reagents, 8ml water samples, compared with prior art, with few reagent dosage and waste liquid discharging amount, substantially reduce waste liquid and return
Receive processing cost and attendant's workload.
The potassium peroxydisulfate, sodium hydroxide reagent are separately deposited, and independently enter reagent during measurement successively, and the shelf-life of reagent is big
In 2 months；《The measure alkaline chitinase of water quality total nitrogen clears up ultraviolet spectrophotometry》The manner of formulation of (HJ636-2012)
For potassium peroxydisulfate and NaOH are mixed into a kind of reagent, the shelf-life is one week, is the reason for possible, potassium peroxydisulfate and hydroxide
Sodium mixed storage, the failure for accelerating potassium peroxydisulfate is gone bad, and reduces oxidability；The present invention uses potassium peroxydisulfate and hydroxide
Sodium separately deposits, independently enter the mode of reagent successively, significantly the extension reagent shelf-life.Using 3 automatic Calibrations, binomial number
According to fitting, based on mass data test analysis, in range ability, the standard liquid for choosing optium concentration is marked as amount, instrument
To aimed concn, the error of indication of measurement result meets automatic dilution within ± 5%《Total nitrogen water quality automatic analyzer technology
It is required that》The requirement of (HJ/T 102-2003).
High-temperature Digestion pond of the present invention and colorimetric pool are separate, and water sample to be measured is cleared up reaction and finished simultaneously in High-temperature Digestion pond
After being cooled to 45 DEG C, measurement in colorimetric pool is transferred to；High-temperature Digestion pond of the present invention uses corrosion-resistant, resistant to elevated temperatures quartz glass
Pipe, colorimetric pool uses the quartz circulation cuvette with good optical permeability, with common High-temperature Digestion pond and colorimetric pool integrally
Formula design is compared, and the present invention can avoid thermokalite contrastive colours pond from corroding the detection error brought, there is provided stablize, effectively detect ring
Border.
Above specific embodiment has been described in detail to the present invention, but these are not constituted to limit of the invention
System.Protection scope of the present invention is not limited with above-mentioned implementation method, as long as those of ordinary skill in the art are according to institute of the present invention
Equivalent modification or change that disclosure is made, should all include in the protection domain described in claims.
Claims (10)
1. a kind of total nitrogen in-line analyzer, including the peristaltic pump for providing sampling power, the metering mould being connected by pipeline
Block, at least one valve, detection module, the valve include multiple-way valve, the high temperature high pressure valve for pipeline switching；The total nitrogen
In-line analyzer also includes High-temperature Digestion module and the water sample, amount mark, zero standard, waste liquid and at least one examination that are connected with multiple-way valve
Agent pipeline, the peristaltic pump is communicated by pipeline with metering module, and the upper end of the metering module communicates with peristaltic pump, lower end with
Multiple-way valve is communicated, and the multiple-way valve is by different pipelines and public pipeline, High-temperature Digestion module, the detection module of metering module
Communicated with the water sample in agent bin, amount mark, zero standard, waste liquid and at least one reagent cartridge, the High-temperature Digestion module it is upper and lower
Two ends are respectively arranged with high temperature high pressure valve, and lower end communicates with multiple-way valve, and upper end communicates with air；It is characterized in that：The detection
Module includes deuterium lamp, lens group, single beam fibre, biconvex lens, colorimetric pool, planoconvex spotlight, bifurcation fiber, two kinds of optical filters, silicon
Photocell, the component is linked in sequence successively, constitutes complete detection light path, wherein, two kinds of optical filters are respectively placed in bifurcation fiber
Two signal output heads, it is corresponding with silicon photocell.
2. a kind of total nitrogen in-line analyzer according to claim 1, it is characterised in that：The total nitrogen in-line analyzer is also wrapped
The control system of each module operation of control is included, using the control chip based on ARM kernels as main control unit, and real-time operation is embedded in
System, creates multiple operation tasks：
Task one：It is responsible for controlling pump, photoelectric metering, multiple-way valve, heating, temperature detection, detection functional module of opening the door, and by height
Precision AD conversion chip gathers photosignal data, and measurement result is calculated using integral algorithm and standard curve；
Task two：It is responsible for carrying out real-time communication with display panel module, and the information such as measurement result and measuring state is uploaded to aobvious
Display screen carries out storage and shows；
Task three：It is responsible for receiving remote operation and upgrade command, and externally transmission measurement result；
Task four：It is responsible for receiving the configuration-direct of display screen, carries out the instruction interaction of control system and display.
3. a kind of total nitrogen in-line analyzer according to claim 1, it is characterised in that：The length of the total nitrogen in-line analyzer
Respectively 37cm, 25cm, 54cm high wide, volume is 0.05m3.
4. a kind of total nitrogen in-line analyzer according to claim 1, it is characterised in that：The optical filter is to pass through respectively
The optical filter of 220nm wavelength and 275nm wavelength.
5. a kind of total nitrogen in-line analyzer according to claim 1, it is characterised in that：The minimum metering of metering module is single
Position is 0.5ml, and highest measurement unit is 2ml.
It is 6. a kind of to use the method that total nitrogen in-line analyzer detects total nitrogen according to claim 1, it is characterised in that：The inspection
Surveying module operation principle is：Deuterium lamp sends ultraviolet light as light source, by after lens group optically focused, by single beam fibre transmit to
Biconvex lens, ultraviolet light is by after biconvex lens optically focused, through colorimetric pool, part ultraviolet light is inhaled by the water sample in colorimetric pool
Receive, transmitted light by after planoconvex spotlight optically focused, optical filter being transferred to by bifurcation fiber, transmitted light by optical filter, by other
The signal of wavelength is filtered out, and retains target detection wavelength signals, reaches silicon photocell, and optical signal is converted to telecommunications by silicon photocell
Number, then high-precision AD conversion chip is entered into by signal conditioning circuit carry out analog-to-digital conversion for data signal is processed,
The raw digital signal of measured value and reference value calculates measurement absorbance by smothing filtering algorithm and integral algorithm, then passes through
Standard curve algorithm calculates measurement concentration.
7. the method that a kind of total nitrogen in-line analyzer according to claim 6 detects total nitrogen, it is characterised in that：By described
Metering module, the total nitrogen in water sample is often measured once, and required reagent potassium peroxydisulfate volume is 1ml, NaOH and hydrochloric acid
Volume is 0.5ml, and 2mL reagents, 8ml water samples are needed altogether.
8. the method that a kind of total nitrogen in-line analyzer according to claim 6 detects total nitrogen, it is characterised in that：The reagent
Potassium peroxydisulfate, NaOH are separately deposited, and independently enter reagent during measurement successively, and the shelf-life of reagent is more than 2 months.
9. the method that a kind of total nitrogen in-line analyzer according to claim 6 detects total nitrogen, it is characterised in that：Using 3 points
Automatic Calibration, binomial data fitting, based on mass data test analysis, in range ability, chooses the standard of optium concentration
Solution is marked as amount, instrument automatic dilution to aimed concn, and the error of indication of measurement result meets within ± 5%《Total nitrogen water
Matter automatic analyzer technical requirements》The requirement of (HJ/T 102-2003).
10. the method that a kind of total nitrogen in-line analyzer according to claim 6 detects total nitrogen, it is characterised in that：High temperature disappears
Xie Chi and colorimetric pool are separate, and water sample to be measured is cleared up after reaction finishes and be cooled to 45 DEG C in High-temperature Digestion pond, is transferred
Measured into colorimetric pool, wherein High-temperature Digestion pond is corrosion-resistant, resistant to elevated temperatures quartz glass tube, and it is quartz that colorimetric pool uses material
Circulation cuvette.
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Application publication date: 20170531 |