CN210487705U - Universal titration apparatus capable of controlling dripping speed and droplet size - Google Patents
Universal titration apparatus capable of controlling dripping speed and droplet size Download PDFInfo
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- CN210487705U CN210487705U CN201921219105.0U CN201921219105U CN210487705U CN 210487705 U CN210487705 U CN 210487705U CN 201921219105 U CN201921219105 U CN 201921219105U CN 210487705 U CN210487705 U CN 210487705U
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- titration
- drainage needle
- air valve
- tube
- universal
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- 238000004448 titration Methods 0.000 title claims abstract description 64
- 239000007788 liquid Substances 0.000 claims abstract description 44
- 238000007664 blowing Methods 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 10
- -1 polytetrafluoroethylene Polymers 0.000 abstract description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 abstract description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 19
- 239000000243 solution Substances 0.000 description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 238000002474 experimental method Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000002585 base Substances 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- 230000007062 hydrolysis Effects 0.000 description 6
- 238000006460 hydrolysis reaction Methods 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 4
- 150000001413 amino acids Chemical class 0.000 description 4
- 108090000623 proteins and genes Proteins 0.000 description 4
- 102000004169 proteins and genes Human genes 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 108010009736 Protein Hydrolysates Proteins 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 2
- 239000003531 protein hydrolysate Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003637 basic solution Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000008098 formaldehyde solution Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 125000004029 hydroxymethyl group Chemical group [H]OC([H])([H])* 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229940054441 o-phthalaldehyde Drugs 0.000 description 1
- ZWLUXSQADUDCSB-UHFFFAOYSA-N phthalaldehyde Chemical compound O=CC1=CC=CC=C1C=O ZWLUXSQADUDCSB-UHFFFAOYSA-N 0.000 description 1
- 229920001184 polypeptide Polymers 0.000 description 1
- 102000004196 processed proteins & peptides Human genes 0.000 description 1
- 108090000765 processed proteins & peptides Proteins 0.000 description 1
- 230000007065 protein hydrolysis Effects 0.000 description 1
- 230000017854 proteolysis Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229940099259 vaseline Drugs 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a can control the general type titration outfit of dropping speed and liquid droplet size, including buret body (1), buret body (1) top is equipped with the dropping speed controlling means, and buret body bottom is sharp mouth, and the terminal one side of sharp mouth is equipped with drainage needle (2), and sharp mouth and drainage needle go up the cover have and seal cover (3), and the outside of drainage needle (2) still is equipped with gas blowing device. The utility model provides a titration outfit acid-base titrates generally, has solved the problem that current general type buret of polytetrafluoroethylene is difficult to the exhaust bubble, can adjust the liquid drop velocity of flow and liquid drop size simultaneously, and the drainage needle and the gas blowing device of design can improve the dropping speed of liquid drop, practice thrift titration time, raise the efficiency, low in manufacturing cost.
Description
Technical Field
The utility model relates to a chemical analysis laboratory glassware especially relates to a general type titration outfit of ability control dropping speed and liquid droplet size.
Background
Protein is a high-nutrition compound, but is not as good as amino acid for human body absorption. Therefore, in order to improve the efficacy of protein, it is often necessary to hydrolyze the protein to obtain polypeptide or amino acid, and the commonly used measurement methods of the degree of protein hydrolysis are formaldehyde titration method, o-phthalaldehyde method, hydrated-imprinted-triketone method, and the like.
The method for measuring the hydrolysis degree of protein by formaldehyde titration is based on the combination of free ammonia and formaldehyde to form hydroxymethyl derivatives, so that hydrogen ions on the free ammonia are released, the free hydrogen ions are titrated by alkali to measure the amino nitrogen, and the content of free amino is calculated.
The basic experimental apparatus adopted by the formaldehyde titration method is a burette, which is the most basic measuring apparatus in volumetric analysis and is used for measuring the volume of solution flowing out of the burette during titration, and the burette is generally divided into an acid burette and a basic burette.
The acid burette is also called plug burette, and its lower end is equipped with glass cock switch for containing acid solution, oxidizing solution and salt solution, but not containing alkaline solution such as sodium hydroxide, etc. When the glass plug is used, liquid leakage often occurs at the position of the glass plug, vaseline is coated on the glass plug to easily block the pipe body, and the glass plug often falls off and is broken in the washing process to cause the rejection of the whole burette.
The basic burette is also called a non-plug burette, the lower end of the basic burette is provided with a rubber tube, the middle of the basic burette is provided with a glass bead which is used for controlling the flow rate of the solution, the basic burette is used for containing the basic solution and the non-oxidizing solution, the solution which can act with the rubber tube can not be filled into the basic burette, the requirement on experience is higher when the basic burette is used, and for students who use occasionally, the dripping speed of the solution is not easy to control, so that the dripping speed is too high, the dripping speed exceeds the titration end point, and the experiment.
Because acid-base burettes have respective defects, general acid-base burettes appear in the market, the general acid-base burettes adopt polytetrafluoroethylene which is not afraid of alkali as a rotary piston, but the general burettes are the same as the piston lower part of the traditional acid-base burette, bubbles are easy to accumulate, and the final titration result is influenced if the general burette carries the bubbles to carry out titration, so that the titration experiment can be carried out only by discharging the bubbles. The general method is to discharge a large amount of solution or flap the position of a piston of the burette, but sometimes the bubbles cannot be discharged, so that the user only holds the suction bulb to suck the bubbles out from the bottom end of the burette, but the suction bulb easily pollutes the solution in the burette, and the general burette is not strong in practicability.
In addition, when the traditional acid-base burette or the current general burette is close to the titration end point, the titration speed needs to be strictly controlled, so that the titration liquid and the liquid to be detected can fully react, and the titration end point is prevented from being exceeded. Because the surface tension exists in the liquid drop, only the liquid drop is large enough, the gravity is larger than the surface tension at the moment, the liquid drop falls into the liquid to be tested under the action of the gravity, and if the last liquid drop is too large, the titration end point is exceeded, so that the titration experiment fails. Therefore, the success of the titration experiment can not be guaranteed only by controlling the dropping speed, when the end point is approached, the size of the liquid drop during dropping is also required to be controlled, half-drop and half-drop are added, the control is difficult, and meanwhile, the half-drop dropping time is slow, so that the experiment operation is influenced. Although the automatic titration device appears in the market at present, the dropping speed and the size of liquid drops can be controlled, the manual ability of students is not favorably improved, and the cost of each device is higher, so that the automatic titration device is not suitable for experimental teaching of high schools or the department with larger burette demand.
SUMMERY OF THE UTILITY MODEL
The utility model provides a not enough to prior art, the utility model provides a can control the general type titration outfit of dripping speed and droplet size can solve the problem that current general type buret is difficult to the discharge bubble, still controls the dripping speed and the droplet size of titrating solution simultaneously easily.
The technical scheme of the utility model as follows: a general titration apparatus capable of controlling the dropping speed and the size of liquid drops comprises a titration tube body 1, wherein a dropping speed control device is arranged at the top end of the titration tube body 1, a sharp mouth is arranged at the bottom end of the titration tube body, a drainage needle 2 is arranged at one side of the tail end of the sharp mouth, a sealing sleeve 3 is sleeved on the sharp mouth and the drainage needle, and an air blowing device is further arranged at the outer side of the drainage needle 2;
the blowing device comprises a double-layer conical ring 4 with a closed top end and an open bottom end, and an air bag 5 is connected inside the top end of the double-layer conical ring 4;
the dripping speed control device comprises a screw rod manual air pump, a connecting pipe 7 and a first air valve 8, one end of the connecting pipe 7 is connected with the burette body 1 in a sealing mode, the other end of the connecting pipe is connected with the screw rod manual air pump, the first air valve 8 is further arranged at one end, close to the screw rod manual air pump, of the connecting pipe, and the first air valve can be connected with the manual vacuum pump.
Preferably, one end of the connecting pipe 7 is connected with the burette body 1 in a sealing manner, the other end of the connecting pipe is connected with a Y-shaped adapter pipe 14, one end of the connecting pipe close to the adapter pipe 14 is further provided with a first air valve 8, one end of the adapter pipe 14 is connected with a first screw rod manual air pump 6 with a large volume, the other end of the adapter pipe is connected with a second screw rod manual air pump 9 with a small volume, the adapter pipe is further provided with a second air valve 11, and both the first air valve 8 and the second air valve 11 can be connected with the manual vacuum pump.
Preferably, the sealing sleeve 3 seals the end of the sharp mouth, and a needle hole for placing a drainage needle is arranged in the sealing sleeve.
Preferably, the length of the drainage needle 2 is 0.3-1.5 cm, and further preferably, the length of the drainage needle is 1 cm. The drainage needle is designed to reduce the surface tension of the liquid drop and improve the dropping speed of the liquid drop.
Preferably, the burette body 1 is fixed on an iron stand of the magnetic stirrer 10 through a fixing clamp, and a sharp mouth of the burette body extends into the conical flask by 0.5-2 cm; double-deck toper ring 4 passes through the fixation clamp to be fixed on magnetic stirrers's iron stand, and the internal diameter of double-deck toper ring 4 bottom is 1 ~ 5mm bigger than drainage needle diameter, and the bottom of double-deck toper ring is 2 ~ 5mm apart from the bottom of drainage needle.
Further, the dripping speed control device is fixed on an iron stand of the magnetic stirrer or placed on an experiment table.
The working principle of the utility model is as follows: the utility model provides a titration outfit utilizes atmospheric pressure to promote to titrate the liquid and drips, air valve department connects manual vacuum pump evacuation, the titration process makes the inside exhaust of whole device be negative pressure state, rotatory manual air pump of promotion hob makes to titrate the liquid and drips out, can set up two manual air pumps of hob, select the manual air pump of hob that is fit for according to titrating the condition, for example can select to change small second hob manual air pump when closing on titrating the terminal point, reduce the liquid drop volume, half drips and half drips, the liquid drop speed is slower this moment, adopt manual extrusion gasbag to blow and make it fall into the erlenmeyer flask to the liquid drop, accelerate the titration process. If the air of the screw rod manual air pump is used up in the titration process, the first air valve at the top end of the rubber tube is closed, the second air valve on the adapter tube is opened to suck air, and then the titration is continuously completed.
Compared with the prior art, the utility model discloses following beneficial effect has: the utility model provides a titration outfit acid-base titrates generally, has solved the problem that current general type buret of polytetrafluoroethylene is difficult to the exhaust bubble, can adjust the liquid drop velocity of flow and size simultaneously, and the drainage needle and the gas blowing device of design can improve the dropping speed of liquid drop, practice thrift titration time, raise the efficiency, low in manufacturing cost.
Drawings
FIG. 1 is a schematic structural diagram of a titration apparatus provided by the present invention;
FIG. 2 is a cross-sectional view of the titration apparatus;
FIG. 3 is a schematic structural view of a dropping speed control device;
FIG. 4 is a schematic structural view of a burette body;
the labels in the figure are: 1-a burette body, 2-a drainage needle, 3-a sealing sleeve, 4-a double-layer conical ring, 5-an air bag, 6-a first screw rod manual air pump, 7-a connecting pipe, 8-a first air valve, 9-a second screw rod manual air pump, 10-a magnetic stirrer, 11-a second air valve, 12-a fixing clamp, 13-a conical flask and 14-an adapter pipe.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the following specific embodiments and the accompanying drawings, but the present invention is not limited to the following technical solutions.
Example 1
As shown in figures 1-4, a general titration apparatus capable of controlling the dripping speed and the size of liquid drops comprises a burette body 1, wherein a dripping speed control device is arranged at the top end of the burette body 1, the bottom end of the burette body is a sharp nozzle, a drainage needle 2 is arranged at one side of the tail end of the sharp nozzle, and the length of the drainage needle is 1 cm. The tip mouth and the drainage needle are sleeved with a sealing sleeve 3, the sealing sleeve 3 seals the tail end of the tip mouth, and a needle hole for placing the drainage needle is arranged in the sealing sleeve.
An air blowing device is also arranged at the outer side of the drainage needle 2 and comprises a double-layer conical ring 4 with a closed top end and an open bottom end, and an air bag 5 is connected inside the top end of the double-layer conical ring 4;
the dripping speed control device comprises a connecting pipe 7, one end of the connecting pipe 7 is in sealing connection with the burette body 1 (sealing connection can be achieved through an adapter), the other end of the connecting pipe is connected with a Y-shaped adapter pipe 14, and one end, close to the adapter pipe 14, of the connecting pipe 7 is provided with a first air valve 8. One end of the adapter tube 14 is connected with the first screw rod manual air pump 6 with a large volume, the other end of the adapter tube is connected with the second screw rod manual air pump 9 with a small volume, a second air valve 11 is further arranged on the adapter tube, and both the first air valve 8 and the second air valve 11 can be connected with the manual vacuum pump.
The burette body 1 is fixed on an iron stand of the magnetic stirrer 10 through a fixing clamp, and a sharp mouth of the burette body extends into the conical flask by 1 cm; the double-layer conical ring 4 is fixed on an iron stand of the magnetic stirrer through a fixing clamp, the inner diameter of the bottom end of the double-layer conical ring 4 is 3mm larger than the diameter of the drainage needle, and the distance from the bottom of the double-layer conical ring to the bottom end of the drainage needle is 3 mm. The dripping speed control device is fixed on an iron stand of the magnetic stirrer or placed on an experiment table.
Taking the formaldehyde titration method for measuring the degree of proteolysis as an example, the titration device is used as follows:
degree of hydrolysis ═ (amount of amino nitrogen after hydrolysis/total nitrogen content of sample) × 100%;
the principle of measuring the amount of amino nitrogen after hydrolysis is as follows: the amino acid contains amino and carboxyl, has amphiprotic property, can eliminate the alkalinity by adding formaldehyde and the action of the amino in the amino acid, makes the carboxyl show acidity, titrates with sodium hydroxide standard solution, and can quantify the amino nitrogen after hydrolysis.
Respectively sucking 2mL of protein hydrolysate with different degrees of hydrolysis, adding 5mL of distilled water into a beaker, adding 5 drops of phenolphthalein indicator into the beaker, mixing, adding 2.0mL of neutral formaldehyde solution, mixing again, and titrating microscopic pink with 0.1mol/L of sodium hydroxide.
Fix buret body 1 on the iron stand of magnetic stirrers 10 through the fixation clamp, according to the position of the altitude mixture control buret body of erlenmeyer flask, guarantee that the buret point mouth stretches into about 1cm of erlenmeyer flask, the erlenmeyer flask is built-in to be equipped with the protein hydrolysate of waiting to titrate.
When sodium hydroxide titration liquid is filled, the top end of a titration tube body 1 is separated from a connecting tube, a sealing sleeve 3 is plugged at the bottom of the titration tube body 1, the liquid is poured, air in the titration tube is discharged by flapping after the liquid is filled, then a titration speed control device is installed, a second air valve 11 on an adapter tube 14 and a first air valve 8 on a connecting tube 7 are opened, the second air valve or the first air valve is connected with a manual vacuum cylinder for exhausting until bubbles appear in the titration liquid, so that the titration liquid is in a negative pressure state, the second air valve is closed after the titration is finished, then the sealing sleeve 3 is opened, a small amount of titration liquid flows out, the liquid level needs to be adjusted to be aligned with a zero scale or a certain scale position by a screw rod air pump, then a double-layer conical ring 4 is installed, the inner diameter of the bottommost end of the double-layer conical ring 4 is about 3mm larger than the diameter of a drainage needle, the bottom of the double-layer conical ring is 3mm away from the bottom end of the drainage needle, and then the conical bottle filled with the liquid to be detected is placed below the burette.
During titration, the screw rod hand-operated air pump can be placed in a place where an operator is convenient to operate, the first screw rod hand-operated air pump 6 is rotationally pushed, pushing air enables titration solution to drip, when the titration end point is approached, the second screw rod hand-operated air pump 9 with small volume can be selected to be replaced, the volume of liquid drops is reduced, half liquid drops and half liquid drops are dripped, the dropping speed of the liquid drops is low, the air bag 5 is manually squeezed to blow to the liquid drops, the liquid drops are made to fall into a conical flask, if the air of the screw rod hand-operated air pump is used completely in the titration process, the first air valve 8 on the top end of the rubber tube is closed, the second air valve 11 is opened, air suction is carried.
Claims (6)
1. A general titration device capable of controlling the dripping speed and the size of liquid drops comprises a titration tube body (1) and is characterized in that a dripping speed control device is arranged at the top end of the titration tube body (1), a sharp mouth is arranged at the bottom end of the titration tube body, a drainage needle (2) is arranged at one side of the tail end of the sharp mouth, a sealing sleeve (3) is sleeved on the sharp mouth and the drainage needle, and an air blowing device is further arranged at the outer side of the drainage needle (2);
the blowing device comprises a double-layer conical ring (4) with a closed top end and an open bottom end, and an air bag (5) is connected inside the top end of the double-layer conical ring (4);
the dripping speed control device comprises a screw rod manual air pump, a connecting pipe (7) and a first air valve (8), one end of the connecting pipe (7) is connected with the burette body (1) in a sealing mode, the other end of the connecting pipe is connected with the screw rod manual air pump, the end, close to the screw rod manual air pump, of the connecting pipe is further provided with the first air valve (8), and the first air valve can be connected with the manual vacuum pump.
2. The universal titration apparatus capable of controlling the dripping speed and the droplet size according to claim 1, wherein one end of the connecting tube (7) is hermetically connected with the titration tube body (1), the other end of the connecting tube is connected with a Y-shaped adapter tube (14), a first air valve (8) is further arranged at one end of the connecting tube close to the adapter tube (14), one end of the adapter tube (14) is connected with a first screw rod manual air pump (6) with a large volume, the other end of the adapter tube is connected with a second screw rod manual air pump (9) with a small volume, a second air valve (11) is further arranged on the adapter tube, and both the first air valve (8) and the second air valve (11) can be connected with the manual vacuum pump.
3. The universal titration device according to claim 1, wherein the closing sleeve (3) seals the tip end and a needle hole for placing a drainage needle is provided in the closing sleeve.
4. The universal titration device capable of controlling the dropping speed and the size of the liquid drop according to claim 1, wherein the length of the drainage needle (2) is 0.3-1.5 cm.
5. The universal titration apparatus capable of controlling the dropping speed and the size of the liquid drop according to claim 1, wherein the burette body (1) is fixed on an iron stand of the magnetic stirrer (10) by a fixing clamp, and the tip of the burette body extends into the conical flask by 0.5-2 cm; double-deck toper ring (4) are fixed on magnetic stirrers's iron stand through the fixation clamp, and the internal diameter of double-deck toper ring (4) bottom is 1 ~ 5mm bigger than drainage needle diameter, and the bottom of double-deck toper ring is 2 ~ 5mm apart from the bottom of drainage needle.
6. The universal titration apparatus capable of controlling the dropping speed and the size of the liquid drop according to claim 5, wherein the dropping speed control device is fixed on an iron stand of a magnetic stirrer or placed on a laboratory table.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921219105.0U CN210487705U (en) | 2019-07-31 | 2019-07-31 | Universal titration apparatus capable of controlling dripping speed and droplet size |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921219105.0U CN210487705U (en) | 2019-07-31 | 2019-07-31 | Universal titration apparatus capable of controlling dripping speed and droplet size |
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| Publication Number | Publication Date |
|---|---|
| CN210487705U true CN210487705U (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921219105.0U Expired - Fee Related CN210487705U (en) | 2019-07-31 | 2019-07-31 | Universal titration apparatus capable of controlling dripping speed and droplet size |
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| CN (1) | CN210487705U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113156051A (en) * | 2021-04-08 | 2021-07-23 | 卢莹 | Engineering geological exploration water quality analysis method |
-
2019
- 2019-07-31 CN CN201921219105.0U patent/CN210487705U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113156051A (en) * | 2021-04-08 | 2021-07-23 | 卢莹 | Engineering geological exploration water quality analysis method |
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