Three-electrode electrochemistry dissolved oxygen sensor

Abstract

The invention relates to the field of dissolved oxygen content detection, in particular to a three-electrode electrochemistry dissolved oxygen sensor. The sensor comprises a cylindrical shell of the sensor, a replaceable oxygen permeation membrane, a membrane cover, a gold electrode, a sliver electrode and a platinum electrode, wherein the gold electrode is arranged in the cavity of the cylindrical shell to serve as a working electrode, the sliver electrode serves as an auxiliary electrode, the platinum electrode serve as a sliver protection electrode, and the silver electrode, the gold electrode and the platinum electrode are independently connected with a polarization circuit through leads; the cavity of the cylindrical shell is full of a liquid reaction electrolyte, wherein the electrolyte reaction liquid comprises the following ingredients in parts by weight: 74.55 parts by weight of potassium chloride, 0.561 parts by weight of potassium hydroxide and 1000 parts by weight of water.By use of the electrochemistry dissolved oxygen sensor disclosed by the invention, in a measurement process, oxygen in a water sample is not consumed, detection accuracy is improved, an auxiliary electrode adopts a double-helix structure to increase a contact area with the electrolyte, the response speed of the sensor is improved, the sensor adopts a three-electrode system structure, the electrolyte in the electrolyte is not consumed, the silver of the auxiliary electrode is not consumed, and the service life is greatly prolonged.

Description

technical field [0001] The invention relates to the field of dissolved oxygen content detection, in particular to a three-electrode electrochemical dissolved oxygen sensor. Background technique [0002] The concentration of dissolved oxygen in water is one of the important indicators to assess the degree of water pollution. In a liquid environment, if the concentration of dissolved oxygen is lower than 4mg / L, fish will suffocate and die due to lack of oxygen, while anaerobic bacteria can reproduce in large numbers, making the water stinky. In the field of wastewater treatment, the monitoring of dissolved oxygen concentration can improve the efficiency of degrading harmful organic substances in wastewater and reduce the operating cost of wastewater treatment plants. In the medical field, the dissolved oxygen concentration can reflect the ratio of hemoglobin binding sites occupied by oxygen molecules in the blood, so the dissolved oxygen solubility in the blood can be used fo...

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Problems solved by technology

[0003] The existing electrochemical dissolved oxygen electrodes have the following technical problems: (1) The oxygen in the water sample to be tested needs to be consumed during the detection process, resulting in inaccurate detection results; (2) The electrochemical reaction on the surface of the auxiliary electrode produces silver chloride The precipitation is attached to the surface of the electrode, and the accumulation of precipitation will affect the stability of the dissolved oxygen sensor; (3) The electrolyte needs to be replaced after a few months of use, which wastes a lot of labor costs; (4) The unreasonable design of the auxiliary electrode structure leads to the response speed of the sensor , poor accuracy and stability

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