JP3494945B2 - Organic compound analyzer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic compound analyzer, and more particularly to a continuous online analysis of exhaust gas discharged from a combustion furnace or organic compounds such as dioxins and aromatics in the atmosphere. The present invention relates to an analyzer suitable for.

[0002]

2. Description of the Related Art Due to increasing awareness of the environment and health,
There is an increasing need to control the concentration of gasified organic compounds such as dioxins in the exhaust gas of combustion furnaces and incinerators and aromatics in the atmosphere within regulations. For this reason, there is a demand for an apparatus that analyzes the above substances quickly and with high accuracy.

Looking at the status of recent laws and regulations, regarding the dioxin, the Enforcement Ordinance and Enforcement Regulations of the Waste Disposal Act have been revised and have been enforced since December 1, 1997. This rule requires that each incinerator measure dioxin concentration at least once a year to verify that the dioxin concentration meets the standards. Moreover, 5
Year after year, dioxin emission regulations have been greatly tightened, and highly accurate and inexpensive measurement is desired. In addition, a dioxin-related bill was approved by the Diet in July 1999 and is scheduled to come into force in 2000.

Regarding organic compounds such as aromatics, the revised Air Pollution Control Law came into effect on April 1, 1997, and three substances, benzene, trichlorethylene and tetrachloroethylene, were regulated. It is expected to be extended to the harmful substances of.

The term dioxin used in the present invention includes not only dioxins such as chlorinated dibenzo-p-dioxin and polychlorinated dibenzofuran, but also chlorobenzenes which are an alternative indicator substance thereof. , Chlorophenols and other dioxin precursors are included, and are not to be construed in a narrow sense.

Next, the existing analysis method and apparatus will be described.

The "method for measuring a trace amount of organic substances in exhaust gas from an incinerator" described in Japanese Patent Application Laid-Open No. 4-161849 is provided with two adsorption pipes and guides the exhaust gas to these so as to detect dioxins such as chlorobenzene and chlorophenol. After concentrating the alternative indicator substance in the adsorption tube, the adsorption tube is set in another thermal desorption device to detect these substances. The concentration of dioxins is estimated from the correlation with the precursor of dioxins, which is an alternative indicator substance.

[0008] Further, "Recovery method and analysis method of chlorobenzenes / chlorophenols" described in Japanese Patent Application Laid-Open No. 8-266863 discloses that after a precursor of dioxins such as chlorobenzene and chlorophenol is concentrated in an adsorption tube. , GC / MS (Gas Chromatography / Mass Spectrome
ter) and the like. In this method, the temperature of the dust remover is controlled to 50 to 200 ° C. in order to efficiently extract chlorobenzene and chlorophenol adsorbed on the dust in the exhaust gas from the incinerator and improve the quantitativeness.

An apparatus as shown in FIG. 1 has been proposed as a general on-line organic compound analyzer. FIG. 1 is a configuration diagram thereof. This apparatus mainly comprises a sampling unit 100 for introducing exhaust gas and a pretreatment unit 20 for adsorbing, desorbing and further cleaning the introduced exhaust gas.
0 and an analyzer 300 for analyzing the components of the concentrated gas. The sampling unit 100 includes a sampling nozzle 2 and a dust filter 3, and the pretreatment unit 200 includes a pipe 4 for guiding the sample gas introduced from the sampling unit 100, an adsorption pipe 20 for adsorbing the sample gas, and a sample gas for the adsorption pipe. Suction pump 11 and drain reservoir 5 for guiding
It consists of 2.

A heater and a cooler 30 are attached to the adsorption tube 20 so that it can be heated and cooled. Further, a He gas 51 for desorption of the adsorption tube 20, an organic solvent 50 for cleaning the adsorption tube 20 and a pump 12 for feeding the same are provided, and switching of these flow paths is performed in a sequence by valves 40, 41, 42. It can be done. Analysis unit 300
Is composed of a mass spectrometer or the like for analyzing and quantifying the components of the gas concentrated in the adsorption tube 20.

In operation, first, the valves 40 and 41 are respectively set to the flow path b. Exhaust gas in the flue is a suction pump 11
Is sucked through the sampling nozzle 2. After the dust in the sucked gas is removed by the dust filter 3,
It is introduced into the adsorption tube 20, and the adsorption tube 20 is cooled by the cooler 30 at 0 ° C.
Gaseous organic matter is adsorbed by cooling in the vicinity. Other inorganic substances pass through the adsorption pipe 20 and are discharged to the drain reservoir 52.

After adsorption for a certain period of time, the valves 40, 4
1 and 42 are respectively set to the flow path a and He gas 51 is pushed in. When the heater 30 is gradually raised to about 300 to 400 ° C., the concentrated organic substances in the adsorption tube 20 are gradually desorbed and led to the analysis unit 300. The components can be analyzed by measuring this with a gas chromatography or a mass spectrometer. Valve 4 after gas is exhausted
The inside of the adsorption pipe 20 is cleaned by switching the channels 1 and 42 to the flow path b and flowing the solvent 50. As the solvent 50, dilute hydrochloric acid is used as an inorganic substance and toluene or the like is used as an organic contaminant. In this way, a series of sequences is completed. The analysis from the second time is repeated.

[0013]

The above-mentioned conventional methods include:
The following points were not considered in each case.

Regarding the "method of measuring a trace amount of organic substances in exhaust gas from an incinerator" described in Japanese Patent Laid-Open No. 4-161849, it is necessary for an experimenter to set up an adsorption tube, and since it requires manpower, automatic online monitoring is required. No consideration is given to the system.

Regarding the "collection method and analysis method of chlorobenzenes / chlorophenols" described in JP-A-8-266863, the sample introduced into the adsorption tube and concentrated is desorbed by heating and collected by the detector. , Part of the sample remains in the adsorption tube. This residue affects the next analysis value, resulting in a decrease in the reproducibility of the quantitative value. Therefore, it is indispensable to consider the removal of the residual sample, that is, the regeneration of the adsorption tube. However, in this method, the adsorption tube is regenerated only by heating, and no consideration has been given to regeneration. Insufficient to remove the residue of the sample and poor in continuity.

The general on-line organic compound analyzer shown in FIG. 1 is an on-line analysis and shows the possibility of continuous measurement, but the measurement intervals are long and intermittent, so Is insufficient. Also,
Due to the life of the adsorption tube, long-term continuous use is difficult.

In view of the above, an object of the present invention is to provide an organic compound analyzer suitable for conducting online analysis of organic compounds in exhaust gas and air in a simple, rapid and continuous manner.

[0018]

In order to achieve the above object, an organic compound analyzer according to the present invention has a sampling unit for introducing a sample gas and an organic compound in the introduced sample gas. In the organic compound analyzer provided with a pretreatment unit for desorption and an analyzer for analyzing the desorbed organic compounds, the pretreatment unit includes a plurality of adsorption tubes and a plurality of adsorption tubes. It is characterized in that it has adsorption pipe holders arranged and a mechanism for continuously switching the adsorption pipes to a plurality of positions, and that a cooling / heating mechanism is provided at the position where each adsorption pipe is located. To do.

According to the present invention, in the above structure, the pretreatment section has a filter attached to the adsorption tube,
Further, the filter is characterized by including a glass filter for trapping dust of sample gas.

Further, the present invention is characterized in that, in the above-mentioned structure, the pretreatment section is provided with a cleaning means for regenerating the adsorption tube.

Further, in the above-mentioned structure according to the present invention, means for introducing a standard gas for quantification is provided between the sampling section or between the sampling section and the pretreatment section, and the standard gas and the sample gas are provided. It is characterized in that it is configured so as to lead to the adsorption pipe in a mixed state. Also, it may be configured to quantify by comparing the standard gas with the sample gas, and further, when the detection level of the standard gas falls below a certain standard, an alarm is generated and the adsorption tube is replaced. Good.

Further, according to the present invention, in the above structure, a series of steps of concentration and desorption by each adsorption tube in the pretreatment section and analysis in the analyzer are continuously performed, and at most one step is deviated. It is characterized in that it is configured to be performed almost at the same time.

Furthermore, according to the present invention, in the above structure, the analyzer is configured to perform intermittent continuous operation by performing analysis during the desorption time of each adsorption tube and connecting the obtained analysis data. Characterize.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 shows a block diagram of an embodiment of an organic compound analyzer according to the present invention. This device is mainly used for exhaust gas or atmosphere (hereinafter, “exhaust gas or atmosphere”).
Is referred to as "sample gas". ) Is introduced, a pretreatment unit 200 for adsorbing, desorbing, and further cleaning the introduced sample gas, an analyzer 300 for component analysis of the concentrated sample gas, and a pretreatment unit 200 and an analyzer 300.
The data processing unit 500 and the control unit 400 for controlling the.

The sampling unit 100 is composed of a sampling nozzle 2 and a dust filter 3, and the sampling nozzle 2 is installed in a flue 1 such as an incinerator or set in an atmosphere sampling place. Further, the structure is such that a standard gas 58 as a standard sample of the measurement object can be introduced if necessary. Further, in order to prevent adsorption and chemical reaction, the sampling unit 100 is maintained at a temperature of about 100 to 250 ° C., which is almost the same as the sample gas. Since it may also contain corrosive substances, SU is normally corrosion resistant.
A material of S or higher is used.

The pre-processing unit 200 is a sampling unit 100.
A pipe 4 for guiding the sample gas introduced from the above, adsorption tubes 21 to 28 for adsorbing the sample gas, and a suction pump 16 for guiding the sample gas to the adsorption tube. Similarly, the pipe 4 is
The temperature is maintained at about 100 to 250 ° C., which is almost the same as that of the sample gas, and the corrosion resistant material is introduced to the pretreatment section 200. The adsorption tubes 21 to 28 are adsorption tube holders 80.
It is fixed in a detachable manner at equal intervals, and is arranged so that the respective processes such as adsorption, desorption, and cleaning are performed at each position.

As shown in FIG. 3, the suction pipe holder 80 is
Adsorption pipe holder upper plate 81 and adsorption pipe holder lower plate 84, which are almost fixed, are provided on both the upper and lower sides, and the adsorption pipe holder upper slider 82 and the adsorption pipe holder lower slider 83 fix the adsorption pipe holders on both sides. The tubes 21 to 28 are rotatable.

As shown in FIG. 4, each of the adsorption tubes 21 to 28 needs a container made of glass or the like because it requires heat resistance and corrosion resistance. As the adsorbent 20b, Tenax, polyurethane, XAD-2 or the like is used. Resin is used. A glass or metal filter 20a is provided at the inlet of the adsorption tube to remove components other than gas. However, when the removal by the dust filter 3 of the sampling unit 100 is sufficient, the filter 20a may not be provided.

At the position of the suction pipe holder 80, the suction pipe 2
A cooler 31 for cooling 1 is provided, and when the sample gas is sucked by the pump 16, the sample gas is adsorbed and concentrated. At the position, a heater 32 is provided to heat the adsorption tube 22 after adsorption to room temperature.
The e gas 56 is passed through and exhausted. At the position, a heater 33 for heating the adsorption pipe 23 to 300 to 400 ° C. is provided, and the organic component desorbed through the He gas 56 is introduced into the analyzer 300.

At position 4, is a cleaning step, and at position 4, a cooler 34 for cooling the adsorption pipe 24 to about room temperature is provided, and a dilute hydrochloric acid 53 of about 0.1 to 1 N is pumped by the pump 13.
To remove dust and dissolved inorganic substances. At the position, methanol 54 is passed through the adsorption pipe 25 to discharge the dilute hydrochloric acid by using the pump 14, and is replaced with the dilute hydrochloric acid. At the position, the adsorbing tube 26 is passed through using toluene, nonane, or decane 55 to remove impurities. At the position, a heater 35 for heating the adsorption pipe 27 to about 100 ° C. is provided, and He or dry air 57 is passed therethrough. The position is in a standby state, refraining from the next concentration, desorption, and washing.

In this embodiment, the number of adsorption tubes is eight, but the number may be any number as long as a series of sequences is possible, and there may be a plurality of standby adsorption tubes. Further, the steps other than the above may be added, or the same step may be repeated depending on the time difference between the steps. That is, if the heating time is twice as long as the concentration time, two heating steps may be secured.

The analysis unit 300 is composed of a mass spectrometer for analyzing and quantifying the components of the gas concentrated in the adsorption tube 20. The mass spectrometer 16 includes a liquid chromatograph / mass spectrometer (LC / MS), a gas chromatograph / mass spectrometer (GC / MS), and the like, and particularly ionizes a gas called APCI (atmospheric pressure chemical ionization) method. A mass spectrometer for performing mass spectrometry is preferable.

According to this, it is possible to instantly measure the desorbed sample of each adsorption tube. The control unit 400 is composed of a control system that controls the sequence of the preprocessing unit 200 and the control of the measurement start and end of the analysis unit 300. Data processing unit 5
A device 00 collects data measured by the analyzer 300, displays a mass spectrum, performs a quantitative calculation, and operates and outputs, which is generally a personal computer or a workstation.

The operation of this embodiment will be described below with reference to FIG. The exhaust gas in the flue is sucked by the suction pump 16 through the sampling nozzle 2. After the dust is removed by the dust filter 3 from the sucked gas, the pipe 4
Is introduced to the adsorption pipe 21 provided at the position of the adsorption pipe holder 80 of the pretreatment unit 200. The sample gas is kept at a temperature of about 100 to 250 ° C. until it is guided to the adsorption tube 21, and the occurrence of adsorption is suppressed as much as possible. In the adsorption tube 21, the gaseous organic substance is adsorbed by cooling to around 0 ° C. by the cooler 31, and after a certain period of time, the concentrated sample is accumulated in the adsorption tube 21. Other inorganic substances pass through the adsorption pipe 21 and are discharged as drain. While the adsorption is being performed, the adsorption tubes 22 to 28 are being processed in different steps.

First, at the position, there is the adsorption tube 22 after the adsorption, and a heater 32 for heating the adsorption tube 22 to about 40 to 60 ° C. is provided. By passing the He gas 56, the contaminants in the adsorption tube, Especially, it is designed to exhaust moisture. The heating temperature here can be increased to a temperature at which the organic compound to be measured does not evaporate, so that the excessive contaminant components can be removed as much as possible.

At the position, there is an adsorption pipe 23 from which impurities are removed, and this is gradually heated to about 300 by a heater 33.
By increasing the temperature to ˜400 ° C. and pushing the He gas 56, the concentrated organic substances are gradually desorbed in the adsorption tube 23 and are introduced to the analysis unit 300. The components can be analyzed by measuring this with a gas chromatography or a mass spectrometer. Particularly in the APCI method, the gas can be instantly ionized and the signal thereof can be captured by the mass spectrometer, so that the components in the adsorption tube can be measured in a few minutes. At this point, the analysis is completed, but the washing step is continued to regenerate the adsorption tube.

At the position, there is the adsorption tube 24 after desorption,
The temperature is gradually returned to about room temperature by the cooler 34. here,
By pumping dilute hydrochloric acid 53 of about 0.5 to 1 N by the pump 13, the inorganic components remaining in the adsorption pipe 24 are dissolved and removed, and discharged as drain.

Further, at the position, the diluted hydrochloric acid accumulated in the adsorption tube 26 is replaced with the methanol 54 by using the pump 14. In position, toluene, nonane or decane 55
Is pumped using the pump 15 to remove impurities from the inside of the adsorption pipe 26.

If it is possible to wash each of the positions 1 to 5 in a short time, it is possible to set one position in the adsorption tube holder 80 and switch the solutions 53 to 55 by valves or the like. Finally, at the position, the adsorption pipe 27 is regenerated by flowing dry air 57 into the adsorption pipe 27 and evaporating the cleaning organic solvent 55. Further, the heater 27 may be used to enhance the effect of evaporation.

Now, a series of adsorption, desorption and washing are performed,
It will be in a standby state until the next adsorption starts. Although only one position is shown in the drawing in the standby state, a plurality of positions can be provided. It may be appropriately determined in consideration of the space of the device and the life of the adsorption tube. Further, since each process has a time difference, it is a key process, for example, the adsorption pipe holder 8 according to the adsorption time.
If 0 is switched and heating takes more time, heating for a plurality of times may be performed. Since the adsorption tube has a life,
If the suction tube can be replaced in the standby state, it can be easily replaced.

Switching of the adsorption tube is performed as shown in FIG.
Suction tube holder slider 8 holding the suction tubes 21 to 28
2 and 83 are performed by rotating and sliding between the fixed upper and lower plates of the suction pipe holder. At the same time, switching of piping etc. is also performed. In this way, adsorption, desorption, and washing are continuously performed without loss time. Control unit 400
Then, the temperature control of the sampling unit 100, the pre-processing unit 20
Sequence control such as 0 adsorption tube switching, pump start / stop, flow rate control, heater / cooler temperature control, etc.
Measurement start and end of 00 and data acquisition control are performed. The data processing unit 500 collects the data measured by the analysis unit 300, displays a mass spectrum, performs a quantitative calculation, and can perform communication with a printer or a host by an apparatus that operates and outputs. PCs and workstations are common.

As described above, according to the embodiment of the present invention, it is possible to continuously, simply and quickly perform online analysis of harmful organic compounds in exhaust gas or air. Moreover,
Since the adsorption tube, which is a long-life product, is used intermittently, there is an effect that the adsorption tube can be continuously used for a long period of time and the adsorption tube can be replaced without stopping the apparatus.

Another embodiment of the present invention is shown in FIGS. As shown in FIG. 5, the adsorption tubes 21 to 28 are
It is the same that the suction pipe holder 80 is detachably fixed to the suction pipe holder 80 at equal intervals, and the treatments such as adsorption, desorption, and cleaning are performed at each position.
The suction pipes 21 to 28 are fixed only to the suction pipe holding machine upper slider 82, and the lower side is opened so that the suction pipes can be easily attached and detached. The inlet / outlet for gas or solvent is provided on one side of the inlet / outlet 86 of the adsorption pipe holder. Similarly, as shown in FIG. 6, the adsorption pipe is provided with an adsorption pipe inlet / outlet 85 for gas or solvent on one side. By opening one side in this way, there is an effect that the adsorption tube can be easily attached and detached, and parts such as a cooler and a heater can be easily attached.

Next, a description will be given when the standard gas is used. The standard gas is generally not the measurement object itself, but is similar in chemical and physical properties, and is selected to exhibit the same behavior as the measurement object. For example, if it is an aromatic system, it is preferable to use hydrogen or carbon isotopes. The purpose of introducing standard gas is to compensate for disturbances up to analysis, measurement conditions, environmental changes, and changes in characteristics over time.

As shown in FIG. 2, the already quantified standard gas 58 is introduced before the dust filter 3 and the pipe 4, at least before being introduced into the adsorption pipe 21. It is desirable to put it in a place as close to the sampling nozzle as possible.
The sample gas and the standard gas sucked by the pump 16 are simultaneously adsorbed by the adsorption pipe 21. Both sample gas and standard gas are measured in flow rate. The operation from adsorption to cleaning is the same as that described with reference to FIGS.

Since a standard sample appears in the data display, quantification is performed with this as a reference. This is shown in FIG.
FIG. 7A shows a case where the mass spectrum changes from A to B when the sample gas is flowed. It is not known whether this is due to the pure fluctuation of the gas, the fluctuation of the collection rate of the adsorption tube inside the apparatus, or the fluctuation of the environment. Therefore, as shown in FIG. 7B, if the measurement is performed simultaneously with the standard gas, it is possible to know whether the variation is due to the variation of the pure sample gas or the variation inside the apparatus. That is, assuming that the sample gas is A and the standard gas is As, the sample gas is changed to B and the standard gas is changed to Bs, the change from As to Bs is the sample in which the change is added due to the influence inside the device. Amount of gas W
Is W = B × Bs / As.

By using the standard gas in this way, it is possible to perform accurate measurement without worrying about adsorption to the pipe or the like, or variation or deterioration of the adsorption pipe. However, since the adsorption characteristics of the adsorption tube deteriorate when it is used many times, the sensitivity decreases as the frequency of use increases. Therefore, in order to ensure the minimum sensitivity, an alarm will be issued when it drops below a certain threshold,
It enables long-term continuous measurement by promoting the exchange of the adsorption tube.

As shown in FIG. 8, the conventional measurement data is also intermittent data when there is one adsorption tube, but by connecting a plurality of adsorption tubes in succession, continuous measurement without an unmeasured portion is possible. it can. On the contrary, if continuous measurement is not necessary, the intermittent time can be set arbitrarily by closing the gas flowing through each pipe with a valve or the like.

[0049]

As described above, according to the present invention, an analyzer suitable for continuous and long-term online analysis of exhaust gas or harmful organic compounds in the atmosphere can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a general online organic compound analyzer.

FIG. 2 is a configuration diagram showing an embodiment of an organic compound analyzer according to the present invention.

FIG. 3 is a configuration diagram showing an embodiment of an adsorption pipe holder according to the present invention.

FIG. 4 is a configuration diagram showing an example of the adsorption tube of FIG.

FIG. 5 is a configuration diagram showing another embodiment of the adsorption pipe holder according to the present invention.

6 is a configuration diagram showing an example of the adsorption tube of FIG.

FIG. 7 is a diagram showing a method for analyzing a mass spectrum using a sample gas and a standard gas according to the present invention.

FIG. 8 is a diagram showing a sequence of adsorption, desorption, and cleaning according to the present invention.

[Explanation of symbols]

1 ... Flue, 2 ... Sampling nozzle, 3 ... Dust filter, 4 ... Introduction piping, 11-16 ... Pump, 20-28 ...
Adsorption tube, 20a ... Filter, 20b ... Adsorption material, 21-2
8 ... Adsorption pipe, 30 ... Cooler, heater, 31, 34 ... Cooler, 32, 33, 35 ... Heater, 40-42 ... Switching valve, 50 ... Organic solvent, 51 ... He, 52 ... Drain reservoir, 53 ... dilute hydrochloric acid, 54 ... methanol, 55 ... toluene, 56 ... He, 57 ... dry air, 58 ... standard gas, 8
0 ... adsorption pipe holder, 81 ... adsorption pipe holder upper plate, 82 ... adsorption pipe holder upper slider, 83 ... adsorption pipe holder lower slider, 84 ... adsorption pipe holder lower plate, 85 ... adsorption pipe inlet / outlet,
86 ... Adsorption pipe holding machine inlet / outlet, 100 ... Sampling section,
200 ... Preprocessing unit, 300 ... Analyzer, 400 ... Control unit,
500 ... Data processing unit.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI G01N 1/28 G01N 30/06 G 30/06 30/88 C 30/88 1/28 K (56) Reference JP 2001- 33433 (JP, A) JP 2001-96136 (JP, A) JP 2000-46820 (JP, A) JP 11-242020 (JP, A) JP 8-266863 (JP, A) JP 10-153591 (JP, A) JP 10-68682 (JP, A) JP 5-312796 (JP, A) JP 55-135744 (JP, A) (58) Fields investigated (Int .Cl. ⁷ , DB name) G01N 30/00-30/96

Claims (8)

(57) [Claims] 1. A sampling unit for introducing a sample gas, and adsorbing organic compounds in the introduced sample gas,
In an organic compound analyzer provided with a pretreatment section for desorption and an analyzer for analyzing the desorbed organic compounds, the pretreatment section arranges a plurality of adsorption tubes and a plurality of the adsorption tubes. a suction tube holding device that has a mechanism for switching the adsorption tube to continuous manner, and cooled to place each adsorption tube is positioned, the organic compound characterized by comprising providing a heating mechanism analysis apparatus. 2. The pretreatment section has a filter provided in association with the adsorption tube, and the filter has a glass filter for trapping dust of the sample gas. The organic compound analyzer according to claim 1. 3. The organic compound analyzer according to claim 1, wherein the pretreatment section includes a cleaning means for regenerating the adsorption tube. 4. A means for introducing a standard gas for quantification is provided between the sampling section or between the sampling section and the pretreatment section, and the standard gas and the sample gas are mixed. The organic compound analyzer according to claim 1, wherein the organic compound analyzer is configured to be guided to the adsorption tube in a state. 5. The organic compound analyzer according to claim 4, which is configured to perform quantification by comparing the standard gas and the sample gas. 6. The method of claim 4, characterized in that to leave the alarm when lower than the reference with the detection level of said standard gas
Alternatively, the organic compound analyzer according to item 5. 7. A series of steps of concentrating and desorbing with each adsorption tube in the pretreatment section and analysis with the analyzer are carried out continuously, and at the same time with a deviation of at most one step. The organic compound analyzer according to claim 1, wherein: 8. The analyzer is configured so that intermittent continuous operation can be performed by analyzing during the desorption time of each of the adsorption tubes and connecting the obtained analytical data. Organic compound analyzer.