CN210166315U - Full-automatic COD analytical equipment - Google Patents
Full-automatic COD analytical equipment Download PDFInfo
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- CN210166315U CN210166315U CN201921060194.9U CN201921060194U CN210166315U CN 210166315 U CN210166315 U CN 210166315U CN 201921060194 U CN201921060194 U CN 201921060194U CN 210166315 U CN210166315 U CN 210166315U
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Abstract
The utility model provides a full-automatic COD analytical equipment, it relates to water detecting instrument technical field, concretely relates to full-automatic COD analytical equipment. It contains flask, condensation reflux unit, heating device, colour identification sensor, precision syringe, titration cell, titration outfit, switching-over valve, connecting pipe, mercuric sulfate solution bottle, potassium dichromate solution bottle, sulphuric acid-silver sulfate solution bottle, ammonium ferrous sulfate solution bottle, iron testing spirit indicator bottle, solenoid valve, the top of flask be provided with condensation reflux unit, the below of flask is provided with heating device, the flask is connected with precision syringe through connecting pipe and switching-over valve. After the technical scheme is adopted, the utility model discloses beneficial effect does: the automatic titration device can automatically add a reagent, automatically clear up, automatically titrate, automatically discharge and automatically clean, adopts a classical reflux method, has completely consistent titration modes, accurate calculation results, convenient and safe operation, non-contact color identification and automatic terminal point judgment, and has the accuracy which is dozens of times higher than that of human eyes.
Description
Technical Field
The utility model relates to a water detecting instrument technical field, concretely relates to full-automatic COD analytical equipment.
Background
COD is a common comprehensive index for evaluating the pollution degree of water. It is an abbreviation of chemical oxygen demand (cod) in english, and the chinese name "chemical oxygen demand" or "chemical oxygen demand" refers to the amount of oxygen consumed by oxidative decomposition of reducing substances (e.g., organic substances) in water using a chemical oxidizing agent (e.g., potassium dichromate). It reflects the degree of pollution of the water body by the reducing substances. The conventional COD analysis device has low automation, complex operation, larger error of a calculation result and poorer repeatability.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to prior art's defect and not enough, provide a full-automatic COD analytical equipment, it can add reagent automatically, automatic clear up, automatic titration, self-cleaning, automatic discharge, adopts the classic reflux method, and the titration mode is unanimous completely, and the calculated result is accurate, convenient operation safety, non-contact discernment colour, the automatic determination terminal point, the accuracy is than people's eye height dozens of times.
In order to achieve the above purpose, the utility model adopts the following technical scheme: it comprises a flask 1, a condensation reflux device 2, a heating device 3, a precision injector 4, a titration cell 5, a color recognition sensor 6, a titration device 7, a reversing valve 8, a connecting pipe 9, a mercury sulfate solution bottle 10, a potassium dichromate solution bottle 11, a sulfuric acid-silver sulfate solution bottle 12, an ammonium ferrous sulfate solution bottle 13, a ferron indicator bottle 14 and an electromagnetic valve 15, wherein the condensation reflux device 2 is arranged above the flask 1, the heating device 3 is arranged below the flask 1, the flask 1 is connected with the reversing valve 8 through the connecting pipe 9, the mercury sulfate solution bottle 10 is connected with the reversing valve 8 through the connecting pipe 9, the potassium dichromate solution bottle 11 is connected with the reversing valve 8 through the connecting pipe 9, the sulfuric acid-silver sulfate solution bottle 12 is connected with the reversing valve 8 through the connecting pipe 9, a public port of the reversing valve 8 is connected with the precision injector 4 through the connecting pipe 9, the flask 1 is connected with a titration cell 5 through a connecting pipe 9, a ferron indicator bottle 14 is connected with an electromagnetic valve 15 through the connecting pipe 9, an ammonium ferrous sulfate solution bottle 13 is connected with the electromagnetic valve 15 through the connecting pipe 9, the titration cell 5 is connected with the electromagnetic valve 15 through the connecting pipe 9, and the electromagnetic valve 15 is connected with a titration device 7 through the connecting pipe 9
The flask 1 is internally provided with a water sample to be tested.
And a color recognition sensor 6 is fixed on the outer side of the body of the titration cell 5.
The connecting pipe 9 is made of corrosion-resistant, acid-base resistant and high-temperature resistant pipe materials, such as polytetrafluoroethylene pipes, polytetrafluoroethylene pipes and the like.
The utility model discloses a theory of operation: before the experiment, a mercury sulfate solution bottle 10, a potassium dichromate solution bottle 11, a sulfuric acid-silver sulfate solution bottle 12, an ammonium ferrous sulfate solution bottle 13 and a ferron indicating liquid bottle 14 are respectively filled with a mercury sulfate solution, a potassium dichromate solution, a sulfuric acid-silver sulfate solution, an ammonium ferrous sulfate solution and a ferron indicating liquid, a water sample to be detected is added into the flask 1, the port of a reversing valve 8 is automatically switched, a reagent in the flask 1 is extracted through a precision syringe 4, whether the mercury sulfate solution is added or not is determined according to the content of chloride ions in the water sample, if the mercury sulfate solution is added, the mercury sulfate solution in the mercury sulfate solution bottle 10 is automatically added into the flask 1, then the potassium dichromate solution in the potassium dichromate solution bottle 11 is extracted into the flask 1, then the sulfuric acid-silver sulfate solution in the sulfuric acid-silver sulfate solution bottle 12 is added into the flask 1, and finally the potassium dichromate solution and the silver sulfate solution are, meanwhile, the heating device 3 starts to heat, the condensation reflux device 2 starts to work, the micro-boiling is kept from the beginning of the boiling of the solution for digestion and reflux for 2 hours, after the solution is cooled to the room temperature, the solution in the flask 1 is extracted into the titration tank 5, the iron testing indication liquid in the iron testing indication liquid bottle 14 is added into the titration tank 5, then the ammonium ferrous sulfate solution in the ammonium ferrous sulfate solution bottle 13 is extracted for titration, after the endpoint color value is titrated through the titration device 7, a control signal is given through the color recognition sensor 6, the titration is stopped, and then the calculation and the judgment are automatically carried out according to the using amount of the ammonium ferrous sulfate standard solution.
After the technical scheme is adopted, the utility model discloses beneficial effect does: the automatic titration device can automatically add a reagent, automatically clear up, automatically titrate, automatically discharge and automatically clean, adopts a classical reflux method, has completely consistent titration modes, accurate calculation results, convenient and safe operation, non-contact color identification and automatic terminal point judgment, and has the accuracy which is dozens of times higher than that of human eyes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of the present invention.
Description of reference numerals: the device comprises a flask 1, a condensation reflux device 2, a heating device 3, a precision syringe 4, a titration cell 5, a color recognition sensor 6, a titration device 7, a reversing valve 8, a connecting pipe 9, a mercury sulfate solution bottle 10, a potassium dichromate solution bottle 11, a sulfuric acid-silver sulfate solution bottle 12, an ammonium ferrous sulfate solution bottle 13, a ferron indicator bottle 14 and an electromagnetic valve 15.
Detailed Description
Referring to fig. 1, the technical solution adopted in the present embodiment is that it includes a flask 1, a condensation reflux device 2, a heating device 3, a precision injector 4, a titration cell 5, a color recognition sensor 6, a titration device 7, a reversing valve 8, a connection tube 9, a mercury sulfate solution bottle 10, a potassium dichromate solution bottle 11, a sulfuric acid-silver sulfate solution bottle 12, an ammonium ferrous sulfate solution bottle 13, a ferron indicator bottle 14, and an electromagnetic valve 15, the condensation reflux device 2 is disposed above the flask 1, the heating device 3 is disposed below the flask 1, a sample to be tested is disposed in the flask 1, the flask 1 is connected with the reversing valve 8 through the connection tube 9, the mercury sulfate solution bottle 10 is connected with the reversing valve 8 through the connection tube 9, the potassium dichromate solution bottle 11 is connected with the reversing valve 8 through the connection tube 9, the silver sulfate-sulfate solution bottle 12 is connected with the reversing valve 8 through the connection tube 9, the change valve 8 is connected with the precision injector 4 through a connecting pipe 9, the flask 1 is connected with the titration cell 5 through the connecting pipe 9, the iron testing solution indicator bottle 14 is connected with the electromagnetic valve 15 through the connecting pipe 9, the ammonium ferrous sulfate solution bottle 13 is connected with the electromagnetic valve 15 through the connecting pipe 9, the titration cell 5 is connected with the electromagnetic valve 15 through the connecting pipe 9, the electromagnetic valve 15 is connected with the titration device 7 through the connecting pipe 9, the mercury sulfate solution bottle 10 is internally provided with a mercury sulfate solution, the potassium dichromate solution bottle 11 is internally provided with a potassium dichromate solution, the sulfuric acid-silver sulfate solution bottle 12 is internally provided with a sulfuric acid-silver sulfate solution, the ammonium ferrous sulfate solution bottle 13 is internally provided with a ferrous ammonium sulfate solution, and the iron testing solution indicator bottle 14 is internally provided with.
The utility model discloses a theory of operation: before the experiment, a mercury sulfate solution bottle 10, a potassium dichromate solution bottle 11, a sulfuric acid-silver sulfate solution bottle 12, an ammonium ferrous sulfate solution bottle 13 and a ferron indicating solution bottle 14 are respectively filled with a mercury sulfate solution, a potassium dichromate solution, a sulfuric acid-silver sulfate solution, an ammonium ferrous sulfate solution and a ferron indicating solution, a water sample to be detected is added in a flask 1, a port of a reversing valve 8 is automatically switched, a reagent in the flask 1 is extracted through a precision syringe 4, and then the experiment is automatically carried out according to the following steps:
s1: determining whether to add a mercuric sulfate solution according to the content of chloride ions in a water sample, wherein the using amount of the mercuric sulfate solution can be added according to the content of the chloride ions in the water sample according to the mass ratio of m [ HgSO4 ] to m [ Cl- ] not less than 20:1, the maximum adding amount is 2ml, and if the largest adding amount needs to be added, an instrument automatically adds the mercuric sulfate solution in a mercuric sulfate solution bottle 10 into a flask 1;
s2: automatically pumping the potassium dichromate solution in the potassium dichromate solution bottle 11 into the flask 1;
s3: automatically adding the sulfuric acid-silver sulfate solution in the sulfuric acid-silver sulfate solution bottle 12 into the flask 1;
s4: uniformly mixing, simultaneously heating by the heating device 3, starting the operation of the condensation reflux device 2, keeping micro-boiling from the boiling of the solution, and performing digestion reflux for 2 hours;
s5: after reflux cooling, 45ml of water is added from the upper end of the condensation tube to flush the condensation tube, so that the volume of the solution is kept at the set value of the system.
S6: after cooling to room temperature, automatically pumping the solution in the flask 1 into a titration cell 5;
s7: automatically adding the iron testing indication liquid in the iron testing indication liquid bottle 14 into the titration cell 5;
s8: automatically extracting the ferrous ammonium sulfate solution in a ferrous ammonium sulfate solution test bottle 13 for titration, after titrating the end point color value through a titration device 7, giving a control signal through a color recognition sensor 6, stopping titration, and then automatically calculating and judging according to the using amount of a ferrous ammonium sulfate standard solution;
s9: after a sample analysis is performed, automatically cleaning the titration cell 5;
s10: according to the steps S1-S9, a blank experiment is carried out by using distilled water with the same volume as a water sample according to the same method and operation steps, the using amount of the ammonium ferrous sulfate standard solution in the blank experiment is automatically recorded, and then the COD result is automatically calculated according to a formula, wherein the formula is as follows: ρ =
；
C is the concentration of the ammonium ferrous sulfate standard solution, mol/L;
V0the volume of the standard solution of ferrous ammonium sulfate consumed by the blank experiment is ml;
V1determining the volume, ml, of the consumed ammonium ferrous sulfate standard solution for a water sample;
V2volume of water sample, ml;
f is the sample dilution factor;
8000 is one fourth of the molar mass of O2, in mg/L;
after the technical scheme is adopted, the utility model discloses beneficial effect does: the automatic titration device can automatically add a reagent, automatically clear up, automatically titrate, automatically discharge and automatically clean, adopts a classical reflux method, has completely consistent titration modes, accurate calculation results, convenient and safe operation, non-contact color identification and automatic terminal point judgment, and has the accuracy which is dozens of times higher than that of human eyes.
The above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (3)
1. The utility model provides a full-automatic COD analytical equipment which characterized in that: it comprises a flask (1), a condensation reflux device (2), a heating device (3), a precise injector (4), a titration cell (5), a color recognition sensor (6), a titration device (7), a reversing valve (8), a connecting pipe (9), a mercury sulfate solution bottle (10), a potassium dichromate solution bottle (11), a sulfuric acid-silver sulfate solution bottle (12), an ammonium ferrous sulfate solution bottle (13), a ferron indicator bottle (14) and an electromagnetic valve (15), wherein the condensation reflux device (2) is arranged above the flask (1), the heating device (3) is arranged below the flask (1), the flask (1) is connected with the reversing valve (8) through the connecting pipe (9), the mercury sulfate solution bottle (10) is connected with the reversing valve (8) through the connecting pipe (9), the potassium dichromate solution bottle (11) is connected with the reversing valve (8) through the connecting pipe (9), the silver sulfate-sulfuric acid solution bottle (12) is connected with a reversing valve (8) through a connecting pipe (9), a public port of the reversing valve (8) is connected with a precision injector (4) through the connecting pipe (9), the flask (1) is connected with a titration cell (5) through the connecting pipe (9), a ferron indicator bottle (14) is connected with an electromagnetic valve (15) through the connecting pipe (9), an ammonium ferrous sulfate solution bottle (13) is connected with the electromagnetic valve (15) through the connecting pipe (9), the titration cell (5) is connected with the electromagnetic valve (15) through the connecting pipe (9), and the electromagnetic valve (15) is connected with a titration device (7) through the connecting pipe (9).
2. The full-automatic COD analyzer according to claim 1, characterized in that: the water sample to be detected is arranged in the flask (1).
3. The full-automatic COD analyzer according to claim 1, characterized in that: and a color recognition sensor (6) is fixed on the outer side of the body of the titration cell (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921060194.9U CN210166315U (en) | 2019-07-09 | 2019-07-09 | Full-automatic COD analytical equipment |
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| CN201921060194.9U CN210166315U (en) | 2019-07-09 | 2019-07-09 | Full-automatic COD analytical equipment |
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| CN210166315U true CN210166315U (en) | 2020-03-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112129959A (en) * | 2020-09-25 | 2020-12-25 | 上海安杰环保科技股份有限公司 | Full-automatic chemical oxygen demand analyzer based on different liquid transfer flow paths |
| CN112946171A (en) * | 2021-01-18 | 2021-06-11 | 浙江华恒交通建设监理有限公司 | Full-automatic EDTA titration detection method |
-
2019
- 2019-07-09 CN CN201921060194.9U patent/CN210166315U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112129959A (en) * | 2020-09-25 | 2020-12-25 | 上海安杰环保科技股份有限公司 | Full-automatic chemical oxygen demand analyzer based on different liquid transfer flow paths |
| CN112129959B (en) * | 2020-09-25 | 2021-06-25 | 上海安杰环保科技股份有限公司 | Full-automatic chemical oxygen demand analyzer based on different liquid transfer flow paths |
| CN113311177A (en) * | 2020-09-25 | 2021-08-27 | 上海安杰环保科技股份有限公司 | Full-automatic chemical oxygen demand analyzer based on different liquid transfer flow paths |
| CN112946171A (en) * | 2021-01-18 | 2021-06-11 | 浙江华恒交通建设监理有限公司 | Full-automatic EDTA titration detection method |
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