A self-compensating, contamination-resistant reference electrode

Abstract

The invention discloses a self-compensation and pollution-resistant reference electrode which comprises a shell and a silver-silver chloride electrode arranged in the shell. The upper end of the silver-silver chloride electrode is connected with a cable while the lower portion of the same is soaked in a reference electrolyte in the shell, a liquid junction is arranged at the lower end of the shell, the reference electrolyte is mixed liquid prepared by silver chloride, potassium chloride, liquid colloid gel and distilled water, the mixed liquid is liquid colloid, solid potassium chloride which is solidified after being molten is added into the reference electrolyte, and the liquid junction is hydrophobic microporous polytef. The self-compensation and pollution-resistant reference electrode has the advantages of high long-term stability and high pollution resistance.

Description

technical field [0001] The invention relates to a reference electrode, in particular to a self-compensating, pollution-resistant reference electrode. Background technique [0002] Reference electrodes are used in many electrochemical sensors or measurement chains, such as potentiometric sensors with ion-selective electrodes, platinum electrodes, etc., which are widely used in laboratories and many industrial fields, such as petrochemical fields, environmental monitoring fields, etc. . According to different use environments, the performance requirements for reference electrodes are also different. Laboratory reference electrodes require good repeatability of the electrode; industrial reference electrodes require long-term stability of the reference potential provided by the electrode, and electrode maintenance work Small quantities, especially in the field of online monitoring of the water environment, have the characteristics of long-term field measurement, complex water q...

AI Technical Summary

Problems solved by technology

The silver-silver chloride reference electrode can be divided into laboratory and industrial on-line reference electrodes according to the use environment. The laboratory reference electrode can slowly seep the electrolyte at the liquid junction. At the same time, it is set on the upper part of the electrode body. There is a liquid filling port to maintain the stability of the electrolyte (such as patent 94246790.6). The electrolyte needs to be added repeatedly during use. The electrode has good repeatability but is troublesome to use; industrial reference electrodes often add gelling agents (such as agar, etc.) to the electrolyte. , making it a solid gel without fluidity, which can prevent the electrolyte from leaking out of the reference electrode, but only allow the ions to move freely, avoiding the trouble of repeated liquid addition, but due to the long-term use of industrial electrodes, especially in water environments In the field of online monitoring, the electrolyte in the reference electrolyte is lost, causing the electrode potential to drift

In addition, because the online monitoring environment of the reference electrode is usually complex, especially in the field of water environment monitoring, ordinary liquid junctions are easily adhered to by pollutants, resulting in blockage of the liquid junction and affecting sensor measurement.

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