Electrochemical sensor
By integrating chip-packaged residual chlorine electrodes and pH electrodes, the problems of large equipment size and low testing accuracy in existing residual chlorine determination methods are solved, achieving highly integrated and highly accurate automated testing.
Patent Information
- Application Number
- CN202423210555.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-24
AI Technical Summary
Existing methods for residual chlorine determination suffer from large equipment size, low integration, and low accuracy due to the flow rate affecting pH data stability during pH electrode testing.
The residual chlorine electrode and pH electrode are highly integrated using chip-based packaging, and combined with an automated compensation algorithm, they ensure the stability of pH testing.
It improves the integration of electrochemical sensors and the convenience of testing, reduces the impact of flow rate on test results, and achieves highly accurate automated testing.
Smart Images
Figure CN223664566U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of electrodes, and particularly relates to an electrochemical sensor. BACKGROUND
[0002] Residual chlorine refers to the content of residual effective chlorine in water after a period of chlorination disinfection, which can be divided into combined residual chlorine and free residual chlorine. Generally, the residual chlorine in tap water is free residual chlorine. After coagulation, sedimentation and filtration, drinking water needs to be disinfected by adding chlorine to reduce most of the bacteria and viruses in the water, and to maintain the existence in the conveying pipeline to achieve the purpose of inhibiting bacterial reproduction and preventing water pollution. Residual chlorine is an important detection parameter of domestic water, industrial water, fishery and electroplating plant wastewater.
[0003] There are many methods for measuring residual chlorine, including o-tolidine visual colorimetric method, iodine titration method (iodine standard solution back titration method), DPD spectrophotometric method and electrode method. The photometric method consumes reagents and produces secondary pollution. The test result of the electrode method is greatly affected by pH and temperature, and needs to be compensated in real time.
[0004] The existing measurement method needs to additionally equip a pH electrode on the basis of the residual chlorine electrode, resulting in a relatively large product size, low integration, and the need for manual compensation calculation. In addition, a certain flow rate is required during the residual chlorine test to ensure the stability of the residual chlorine. However, the high flow rate during the existing pH electrode test will affect the exchange of H ions, affecting the stability of the pH data. There is a certain contradiction between the two, resulting in low accuracy of the electrode method for testing residual chlorine.
[0005] Therefore, it is urgent to develop a high-precision and high-integration electrochemical sensor. CONTENT OF THE INVENTION
[0006] In view of the above technical problems, the utility model provides an electrochemical sensor. The utility model adopts the chip packaging residual chlorine electrode and pH electrode, and the integration is high, which is beneficial to subsequent automatic compensation calculation. The stability of pH test can also be ensured.
[0007] The technical scheme provided by the utility model is as follows:
[0008] An electrochemical sensor comprises:
[0009] The residual chlorine electrode comprises a first substrate, a first reference electrode, and a first working electrode and a first counter electrode packaged by a chip and arranged on the first substrate. The first working electrode is covered with an organic film for isolating the electrode surface and the solution to be measured.
[0010] A pH electrode is a interdigital electrode, comprising a second substrate and a guide rail, a test electrode, a second counter electrode and a second reference electrode arranged on the second substrate; the test electrode is covered with a sensitive film;
[0011] A base is used for integrating and fixing the residual chlorine electrode and the pH electrode.
[0012] In a possible implementation, the first working electrode is a solid circle, the surface is arc-shaped, and the material is gold.
[0013] In a possible implementation, the first counter electrode is a circular ring, and the material is gold or silver.
[0014] In a possible implementation, the first reference electrode is Ag / AgCl, one end of which is fixed to the base, and the other end is suspended above the first substrate.
[0015] In a possible implementation, the organic film is a polydimethylsiloxane film.
[0016] In a possible implementation, the second substrate comprises a bottom plate and a polysilicon plate arranged on the bottom plate.
[0017] In a possible implementation, the guide rail comprises a wide rectangular area and a narrow rectangular area connected to each other; the wide rectangular area is used for connecting an external circuit, and the narrow rectangular area is used for connecting each electrode.
[0018] Further, the material of the guide rail is a metal material.
[0019] In a possible implementation, the material of the test electrode is gold, the material of the second counter electrode is gold, and the material of the second reference electrode is platinum.
[0020] In a possible implementation, the material of the sensitive film is RuO2.
[0021] In a possible implementation, the base comprises at least one base plate; the residual chlorine electrode and the pH electrode are arranged on the base plate.
[0022] In a possible implementation, the electrochemical sensor further comprises a shell for placing and safely fixing the base.
[0023] The beneficial effects of the utility model are as follows:
[0024] (1) The utility model adopts the integrated design of the residual chlorine electrode and the pH electrode packaged by chips, greatly improves the integration degree, has a wider application range, and is more convenient and efficient for testing; the high integration degree is matched with the subsequent compensation algorithm, and better automatic testing can be realized.
[0025] (2) The sensor has small flow velocity influence, stable and reliable performance, and high accuracy. BRIEF DESCRIPTION OF DRAWINGS
[0026] Figure 1 Figure is a structural schematic diagram of the sensor of the utility model;
[0027] Figure 2 Figure is a structural schematic diagram of the residual chlorine electrode;
[0028] Figure 3 Figure is a structural schematic diagram of the pH electrode.
[0029] Figure 4 Figure is a schematic diagram when the sensor with the shell structure is tested.
[0030] In the figure: 100 - residual chlorine electrode, 110 - first substrate, 120 - first reference electrode, 130 - first working electrode, 140 - first counter electrode; 200 - pH electrode, 210 - second substrate, 220 - guide rail, 230 - test electrode, 240 - second counter electrode, 250 - second reference electrode; 300 - base; 400 - shell. DETAILED DESCRIPTION
[0031] The utility model will be described below in combination with specific embodiments, and the content of the utility model is not limited to this.
[0032] EMBODIMENT
[0033] Referring to Figure 1 , it is an electrochemical sensor, comprising:
[0034] The residual chlorine electrode 100 comprises a first substrate 110, a first reference electrode 120, and a first working electrode 130 and a first counter electrode 140 which are packaged in a chip and arranged on the first substrate; the first working electrode 130 is covered with an organic film for isolating the electrode surface and the solution to be measured;
[0035] The pH electrode 200 is an interdigital electrode, comprising a second substrate 210 and a guide rail 220, a test electrode 230, a second counter electrode 240 and a second reference electrode 250 arranged on the second substrate; the test electrode 230 is covered with a sensitive film;
[0036] The base 300 is used for integrating and fixing the residual chlorine electrode 100 and the pH electrode 200.
[0037] In a possible implementation manner, referring to Figure 2 , the first working electrode 130 is a solid circle, the surface is arc-shaped, and the material is gold.
[0038] In a possible implementation manner, the first counter electrode 140 is a circular ring, and the material is gold or silver.
[0039] In a possible implementation, the first reference electrode 120 is Ag / AgCl, one end of which is fixed to the base, and the other end is suspended above the first substrate.
[0040] In a possible implementation, the organic film is a polydimethylsiloxane film. The organic film can allow the active chlorine, hypochlorite ions and chlorine ions to diffuse effectively, that is, the active chlorine, hypochlorite ions and chlorine ions can pass through the organic film, thereby buffering the influence of flow rate on the residual chlorine result, and increasing the stability of the residual chlorine determination.
[0041] In a possible implementation, the material of the first substrate 110 is silicon nitride.
[0042] It can be understood that the chip packaging described in the embodiment is etched on the first substrate, and the first working electrode and the first counter electrode are prepared by photolithography.
[0043] In a possible implementation, the second substrate 210 is a substrate including a bottom plate and a polysilicon plate arranged on the bottom plate.
[0044] Further, the bottom plate is a plastic plate.
[0045] In a possible implementation, referring to Figure 3 , the guide rail 220 includes a wide rectangular region and a narrow rectangular region connected to each other; the wide rectangular region is used to connect an external circuit, and the narrow rectangular region is used to connect each electrode.
[0046] Further, the material of the guide rail 220 is a metal material. Preferably, the material of the guide rail electrode 220 is tin.
[0047] In a possible implementation, the material of the test electrode 230 is gold, the material of the second counter electrode 240 is gold, and the material of the second reference electrode 250 is platinum.
[0048] In a possible implementation, the material of the sensitive film is RuO2.
[0049] It should be noted that each electrode and guide rail of the pH electrode 200 in the embodiment is etched on the polysilicon plate by a photolithography machine to realize chip packaging. The pH electrode does not need to add an electrolyte, is not affected by the flow rate of the solution to be measured, and can ensure the stability of the pH test.
[0050] In a possible implementation, the base 300 includes at least one substrate; the residual chlorine electrode 100 and the pH electrode 200 are arranged on the substrate.
[0051] Further, the base 300 comprises two substrates which are connected by screwing and are spaced apart by a certain distance.
[0052] Further, referring to Figure 4 , the electrochemical sensor further comprises a housing 400 for placing and fixing the base 300.
[0053] The utility model discloses in using, directly put into the solution of being measured to test, each electrode is connected to the MCU (Microcontroller Unit, microcontroller unit) chip mainboard with data processing ability, and then through the built-in supplementary algorithm, the test result is revised to realize the automation test.
[0054] The above, only for the preferred specific embodiment of the application, but the scope of the application is not limited to this, any modification, equivalent replacement and improvement etc. that any skilled in the art of the technical field in the technical range disclosed by the application, should be included in the protection scope of the application.
Claims
1. An electrochemical sensor, characterized in that, The application relates to an electrochemical sensor, comprising: a residual chlorine electrode, comprising: a first substrate, a first reference electrode, and a first working electrode and a first counter electrode which are packaged in a chip and arranged on the first substrate; the first working electrode is covered with an organic film for isolating the electrode surface and a solution to be measured; a pH electrode which is an interdigital electrode, comprising a second substrate and a guide rail, a test electrode, a second counter electrode and a second reference electrode arranged on the second substrate; the test electrode is covered with a sensitive film; a base for integrating and fixing the residual chlorine electrode and the pH electrode.
2. The electrochemical sensor of claim 1, wherein, The first working electrode is a solid circle with an arc-shaped surface and is made of gold.
3. The electrochemical sensor of claim 1, wherein, The first counter electrode is a circular ring and is made of gold or silver.
4. The electrochemical sensor of claim 1, wherein, The first reference electrode is Ag / AgCl, one end of which is fixed to the base and the other end of which is suspended above the first substrate.
5. The electrochemical sensor of claim 1, wherein, The organic film is a polydimethylsiloxane film.
6. The electrochemical sensor of claim 1, wherein, The second substrate comprises a bottom plate and a polysilicon plate arranged on the bottom plate.
7. The electrochemical sensor of claim 1, wherein, The guide rail comprises a wide rectangular area and a narrow rectangular area which are connected; the wide rectangular area is used for connecting an external circuit and the narrow rectangular area is used for connecting each electrode.
8. The electrochemical sensor of claim 7, wherein, The material of the test electrode is gold, the material of the second counter electrode is gold, and the material of the second reference electrode is platinum.
9. The electrochemical sensor of claim 1, wherein, The material of the sensitive film is RuO2.
10. The electrochemical sensor according to any one of claims 1 to 9, wherein, The electrochemical sensor further comprises a shell for placing and fixing the base.