Measuring device capable of preventing pH composite electrodes from pollution and preparation method thereof

Abstract

The invention discloses a measuring device capable of preventing pH composite electrodes from pollution and a preparation method thereof, and belongs to the technical field of pH electrodes. The invention solves the problem that a to-be-measured water body pollutes the pH electrode, so that the accuracy of the measuring is influenced. The measuring device comprises an electrode protection tube, afirst electrode, and a second electrode. The two electrodes are respectively connected to copper wires through silver wires; a protective tube cap is movably connected to one end, close to the pH composite electrode, of the electrode protection tube; an opening is formed in an end face of the protective tube cap; a protective film is fixedly connected to the opening of the protective tube cap. According to the measuring device capable of preventing pH composite electrodes from pollution and the preparation method thereof, the abrasion to electrodes caused by large particles of solid objects inthe flowing water body can be avoided; the pollution to electrodes caused by the colloidal substance and the suspended matters in the water body can be effectively prevented; and the pollution to electrodes caused by bacterial can also be blocked, thereby improving the pH measuring accuracy of the electrodes. The preparation method is simple and easy to implement; and the method is suitable for pH glass electrodes, metal / metal oxide pH electrodes, solid pH electrodes and the like, and is wide in application range.

Description

technical field [0001] The invention belongs to the technical field of pH electrodes, and in particular relates to a measuring device and a preparation method thereof for avoiding pollution of pH composite electrodes. Background technique [0002] The pH composite glass electrode shows a good pH response, which is due to the transfer and diffusion of hydrogen ions, forming a membrane potential inside and outside the glass sensing bulb, so as to achieve the purpose of measuring pH; while metal oxide electrodes (such as titanium / titanium dioxide, iridium / oxide Iridium, tungsten / tungsten oxide, antimony / antimony oxide and lead / lead oxide, etc.) mainly rely on electrode surface oxides to respond to hydrogen ions in the measured water body; while in the test water body (natural water body, laboratory water body, medical water body, There are also colloidal substances (such as: silicic acid, humus colloid, etc.) and suspended solids (such as: clay, sand, bacteria, aquatic animals ...

AI Technical Summary

Problems solved by technology

[0002] The pH composite glass electrode shows a good pH response, which is due to the transfer and diffusion of hydrogen ions, forming a membrane potential inside and outside the glass sensing bulb, so as to achieve the purpose of measuring pH; while metal oxide electrodes (such as titanium / titanium dioxide, iridium / oxide Iridium, tungsten / tungsten oxide, antimony / antimony oxide and lead / lead oxide, etc.) mainly rely on electrode surface oxides to respond to hydrogen ions in the measured water body; while in the test water body (natural water body, laboratory water body, medical water body, There are also colloidal substances (such as: silicic acid, humus colloid, etc.) and suspended solids (such as: clay, sand, bacteria, aquatic animals and plants, etc.) in industrial water bodies, etc. The surface will hinder its response to hydrogen ions, resulting in a delay in the response of the electrode, which will reduce the accuracy to a certain extent, and will also shorten the life of the electrode; in order to avoid contamination of the pH composite electrode, it is necessary to develop electrode protection technology, so we Invention of a measuring device that avoids contamination of the pH composite electrode

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