CN112611833A - Automatic titration device for chemical oxygen demand - Google Patents
Automatic titration device for chemical oxygen demand Download PDFInfo
- Publication number
- CN112611833A CN112611833A CN202011583821.4A CN202011583821A CN112611833A CN 112611833 A CN112611833 A CN 112611833A CN 202011583821 A CN202011583821 A CN 202011583821A CN 112611833 A CN112611833 A CN 112611833A
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- titration
- way valve
- chamber
- pump
- peristaltic pump
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/16—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using titration
- G01N31/162—Determining the equivalent point by means of a discontinuity
- G01N31/164—Determining the equivalent point by means of a discontinuity by electrical or electrochemical means
Abstract
The invention relates to the technical field of water quality monitoring, in particular to an automatic titration device for chemical oxygen demand, which comprises an injection pump, a peristaltic pump, a titration chamber and a titration reagent container; the injection pump, the titration chamber and the titration reagent container are connected through a first three-way valve; the peristaltic pump, the titration chamber and the injection pump are connected through a second three-way valve; a titration reagent is filled in the titration reagent container; an electrode, a temperature sensor and a heating device are arranged in the titration chamber, and an air filtering device is arranged at an inlet of the peristaltic pump; the injection pump, the peristaltic pump, the titration chamber, the titration reagent container, the first three-way valve and the second three-way valve are connected through hoses. The automatic titration device for chemical oxygen demand can improve titration accuracy, reduce titration time and can be automatically controlled.
Description
Technical Field
The invention relates to the technical field of water quality monitoring, in particular to an automatic titration device for chemical oxygen demand.
Background
The existing titration device is large in size and not suitable for being integrated into automatic detection equipment, and the volume of one drop of reagent can only be controlled to be 0.05ml during titration, but cannot be smaller. And whether the chemical reaction reaches the end point or not needs to be detected through color, and the end point cannot be objectively reflected.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an automatic titration device for chemical oxygen demand.
In order to overcome the existing defects, an automatic rapid chemical titration device is provided, the titration precision is improved, the titration time is reduced, and all the devices can be automatically controlled.
The technical scheme adopted by the invention is as follows:
an automatic titration device for chemical oxygen demand comprises an injection pump, a peristaltic pump, a titration chamber and a titration reagent container; the injection pump, the titration chamber and the titration reagent container are connected through a first three-way valve; the peristaltic pump, the titration chamber and the injection pump are connected through a second three-way valve; a titration reagent is filled in the titration reagent container; an electrode, a temperature sensor and a heating device are arranged in the titration chamber, and an air filtering device is arranged at an inlet of the peristaltic pump; the injection pump, the peristaltic pump, the titration chamber, the titration reagent container, the first three-way valve and the second three-way valve are connected through hoses.
Furthermore, the second three-way valve is closed, and when the first three-way valve is opened, the injection pump is connected with the titration reagent container.
Further, an outlet of the first three-way valve is connected with a first inlet of the second three-way valve; and the outlet of the peristaltic pump is connected with the second inlet of the second three-way valve, and the outlet of the second three-way valve is connected with the inlet of the titration chamber.
Further, the surface of the injection pump is marked with scales.
Furthermore, the injection pump is connected with a pressure sensor for measuring the output pressure of the injection pump.
Further, the heating device is an electric heating wire.
Further, the peristaltic pump is provided with a flow regulating device.
Further, the electrode is a redox electrode.
Furthermore, the hose is made of polytetrafluoroethylene.
Further, the first three-way valve and the second three-way valve are electromagnetic three-way valves, mechanical three-way valves or pneumatic three-way valves.
Advantageous effects
The original stirring mode is replaced by the bubbling mode, so that the volume of the equipment can be effectively reduced.
The injection pump is matched with the peristaltic pump, so that the single dosage can be smaller, and the titration precision can be improved.
The titration end point is determined more sensitively by measuring ORP, and the titration precision is improved.
Drawings
FIG. 1 is a schematic structural view;
the device comprises a 1-injection pump, a 2-first three-way valve, a 3-second three-way valve, a 4-peristaltic pump, a 5-air filtering device, a 6-titration chamber, a 7-electrode, an 8-temperature sensor, a 9-heating device, a 10-titration reagent container and an 11-acquisition control circuit.
Detailed Description
Example 1
The invention is further described below with reference to the accompanying drawings.
An automatic titration device for chemical oxygen demand comprises an injection pump 1, a peristaltic pump 4, a titration chamber 6 and a titration reagent container 10.
The injection pump 1, the titration chamber 6 and the titration reagent container 10 are connected through a first three-way valve 2; the peristaltic pump 5, the titration chamber 6 and the injection pump 1 are connected through a second three-way valve 3; the titration reagent container 10 is filled with a titration reagent.
When the second three-way valve is closed and the first three-way valve is opened, the injection pump 1 is connected with the titration reagent container 10, and the injection pump 1 can pump out the titration reagent from the titration reagent container 10; the outlet of the first three-way valve 2 is connected with the first inlet of the second three-way valve 3; the outlet of the peristaltic pump 5 is connected with the second inlet of the second three-way valve 3, and the outlet of the second three-way valve 3 is connected with the inlet of the titration chamber 6;
scales are carved on the surface of the injection pump 1; the injection pump is also connected with a pressure sensor for measuring the output pressure of the injection pump, and the output end of the pressure sensor is electrically connected with the acquisition control circuit 11.
An electrode 7, a temperature sensor 8 and a heating device 9 are arranged in the titration chamber 6, and the heating device 9 is an electric heating wire; after the titration chamber 6 is filled with the titration solution, the liquid temperature can be kept constant at 80 degrees Celsius by the heating device 9 and the temperature sensor. The peristaltic pump 4 is used for pumping air and pushing a reagent into the titration chamber, and an air filtering device is arranged at an inlet of the peristaltic pump 4 and used for bubbling to uniformly mix the reagent; the peristaltic pump 4 is provided with a flow regulating device.
The electrode 7 is an oxidation reduction electrode (ORP electrode), and the electrode 7 is used for measuring a potential value and monitoring whether the reagent is completely reflected or not.
The injection pump 1, the peristaltic pump 4, the titration chamber 6, the titration reagent container 10, the first three-way valve 2 and the second three-way valve 3 are connected through hoses; the hose is made of polytetrafluoroethylene;
the first and second three- way valves 2, 3 may be electromagnetic, mechanical or pneumatic three-way valves. The opening and closing of the first three-way valve 2 and the second three-way valve 3 are controlled by an acquisition control circuit 11.
The automatic titration device for chemical oxygen demand comprises the following steps:
1. the solution to be titrated is first transferred into the titration chamber 6, and the liquid temperature is kept constant at 80 ℃ by the heating device 9 and the temperature sensor 8.
2. The first three-way valve 2 is switched to a titration reagent container 10, the injection pump 1 pumps a full pipe reagent, and the first three-way valve 2 is switched to a main flow path;
3. the second three-way valve 3 is switched to the injection pump 1, the injection pump 1 pushes a specified amount of reagent according to the program setting, the second three-way valve 3 is switched to the peristaltic pump 4, air is pumped by the peristaltic pump to push the reagent into the titration chamber 6, and meanwhile, the titration chamber is bubbled, so that the reagent is completely reacted;
4. and repeating the third step, detecting the change of the number of the electrode 7, and recording the total consumed reagent amount when the ORP electrode suddenly changes.
5. The acquisition control circuit calculates the amount of the consumed reagent to obtain the concentration of the solution to be detected.
The method measurement includes, but is not limited to, the measurement of chemical oxygen demand. The device of the invention replaces the original stirring mode by a bubbling mode, and can effectively reduce the volume of equipment; the injection pump is matched with the peristaltic pump, so that the single dosage can be smaller, and the titration precision can be improved. The titration end point is determined more sensitively by measuring ORP, and the titration precision is improved.
Claims (10)
1. An automatic titration device for chemical oxygen demand is characterized by comprising an injection pump, a peristaltic pump, a titration chamber and a titration reagent container; the injection pump, the titration chamber and the titration reagent container are connected through a first three-way valve; the peristaltic pump, the titration chamber and the injection pump are connected through a second three-way valve; a titration reagent is filled in the titration reagent container; an electrode, a temperature sensor and a heating device are arranged in the titration chamber, and an air filtering device is arranged at an inlet of the peristaltic pump; the injection pump, the peristaltic pump, the titration chamber, the titration reagent container, the first three-way valve and the second three-way valve are connected through hoses.
2. The cod auto-titrating device of claim 1, wherein the second three-way valve is closed and the syringe pump is connected to the titration reagent container when the first three-way valve is opened.
3. The cod automatic titration device according to claim 1, wherein the outlet of the first three-way valve is connected to the first inlet of the second three-way valve; and the outlet of the peristaltic pump is connected with the second inlet of the second three-way valve, and the outlet of the second three-way valve is connected with the inlet of the titration chamber.
4. The cod auto-titration device according to claim 1, wherein the syringe pump is graduated on its surface.
5. The cod auto-titration device according to claim 1, wherein a pressure sensor is connected to the syringe pump to measure the output pressure of the syringe pump.
6. The cod automatic titration device according to claim 1, wherein said heating device is a heating wire.
7. The cod auto-titration device according to claim 1, wherein the peristaltic pump is provided with a flow regulation device.
8. The cod auto-titration device according to claim 1, wherein the electrode is a redox electrode.
9. The cod automatic titration device according to claim 1, wherein the hose is made of teflon.
10. The cod auto-titration device according to claim 1, wherein the first and second three-way valves are electromagnetic three-way valves, mechanical three-way valves, or pneumatic three-way valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011583821.4A CN112611833B (en) | 2020-12-28 | 2020-12-28 | Automatic titration device for chemical oxygen demand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011583821.4A CN112611833B (en) | 2020-12-28 | 2020-12-28 | Automatic titration device for chemical oxygen demand |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112611833A true CN112611833A (en) | 2021-04-06 |
| CN112611833B CN112611833B (en) | 2022-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011583821.4A Active CN112611833B (en) | 2020-12-28 | 2020-12-28 | Automatic titration device for chemical oxygen demand |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011220944A (en) * | 2010-04-13 | 2011-11-04 | C Uyemura & Co Ltd | Automatic titration analyzer, automatic titration analysis method, automatic analysis management system of process liquid and automatic titration analysis method of process liquid |
| JP2012112735A (en) * | 2010-11-22 | 2012-06-14 | Horiba Ltd | Titrator |
| CN203672853U (en) * | 2013-11-25 | 2014-06-25 | 茂名市中准实业有限公司 | Chemical engineering automatic moisture titrator |
| CN203745270U (en) * | 2014-02-20 | 2014-07-30 | 耿炜 | Multi-parameter remote water quality control device with continuously adjustable standard sample concentration |
| CN204439647U (en) * | 2015-03-05 | 2015-07-01 | 山东龙发环境技术股份有限公司 | Laboratory COD automatic analyzer |
| CN206546353U (en) * | 2017-02-20 | 2017-10-10 | 湖北省环境监测中心站 | A kind of COD titration outfit |
| CN110596306A (en) * | 2019-10-17 | 2019-12-20 | 苏州卫水环保科技有限公司 | Water quality detection pipeline system and water quality detection method |
| CN211553896U (en) * | 2019-12-05 | 2020-09-22 | 青岛卓建海洋装备科技有限公司 | Seawater COD online analysis device |
| CN211697482U (en) * | 2019-12-30 | 2020-10-16 | 河北普润环境工程有限公司 | Ultraviolet spectroscopic oil tester |
| CN211955365U (en) * | 2020-04-22 | 2020-11-17 | 上海昂林科学仪器股份有限公司 | Automatic titration outfit that fast and slow combines among titration process |
| 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 |
-
2020
- 2020-12-28 CN CN202011583821.4A patent/CN112611833B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011220944A (en) * | 2010-04-13 | 2011-11-04 | C Uyemura & Co Ltd | Automatic titration analyzer, automatic titration analysis method, automatic analysis management system of process liquid and automatic titration analysis method of process liquid |
| JP2012112735A (en) * | 2010-11-22 | 2012-06-14 | Horiba Ltd | Titrator |
| CN203672853U (en) * | 2013-11-25 | 2014-06-25 | 茂名市中准实业有限公司 | Chemical engineering automatic moisture titrator |
| CN203745270U (en) * | 2014-02-20 | 2014-07-30 | 耿炜 | Multi-parameter remote water quality control device with continuously adjustable standard sample concentration |
| CN204439647U (en) * | 2015-03-05 | 2015-07-01 | 山东龙发环境技术股份有限公司 | Laboratory COD automatic analyzer |
| CN206546353U (en) * | 2017-02-20 | 2017-10-10 | 湖北省环境监测中心站 | A kind of COD titration outfit |
| CN110596306A (en) * | 2019-10-17 | 2019-12-20 | 苏州卫水环保科技有限公司 | Water quality detection pipeline system and water quality detection method |
| CN211553896U (en) * | 2019-12-05 | 2020-09-22 | 青岛卓建海洋装备科技有限公司 | Seawater COD online analysis device |
| CN211697482U (en) * | 2019-12-30 | 2020-10-16 | 河北普润环境工程有限公司 | Ultraviolet spectroscopic oil tester |
| CN211955365U (en) * | 2020-04-22 | 2020-11-17 | 上海昂林科学仪器股份有限公司 | Automatic titration outfit that fast and slow combines among titration process |
| 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 |
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| CN112611833B (en) | 2022-08-23 |
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