Selenium ion selective electrode

A technology of ion selectivity and electrodes, which is applied in the direction of material analysis, measuring devices, instruments, etc. by electromagnetic means, can solve the problems of difficulty in meeting the needs of trace component determination, low sensitivity, short service life of electrodes, etc., and achieve service life Long, reduce electrode impedance, good stability effect

Inactive Publication Date: 2004-12-29
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of electrode responds to the Se in solution 4+ ions, its sensitivity is low, it is difficult to meet the needs of the determination of trace components, and the service life of the electrode is generally short

Method used

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  • Selenium ion selective electrode
  • Selenium ion selective electrode
  • Selenium ion selective electrode

Examples

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Embodiment Construction

[0009] Such as figure 1 , figure 2 As shown, the sensitive film 7 in the present invention is made of the insoluble matter of selenium, silver selenide, as a sensitive material, which is formed by grinding, sieving, and tableting, and is tightly embedded in the electrode head 6 with an adhesive, and the electrode rod 3 The inner silver wire 4 is directly in contact with the inner side of the sensitive membrane 7, and the generated membrane potential is transmitted to the shielding wire 1 and the shielding plug 8 through the silver wire 4 and platinum wire 9, and the electrode rod 3 and the electrode head 6 are connected by threads, which can be conveniently To realize the replacement of the sensitive membrane, a sealing gasket 5 is provided at the threaded connection. The selenium ion selective electrode of the present invention should carry out activation treatment before use, promptly with metallographic sandpaper, the surface of the sensitive membrane is polished, and the...

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Abstract

The selective selenium ion electrode includes electrode body comprising electrode cap, electrode rod and electrode head, sensitive film embedded into the electrode head, silver filament, shielded wire, shielded plug and sealing washer between the shielded plug and the electrode rod. The sliver filament contacts directly the inner side of the sensitive film and connected to the shielded wire via platinum filament, and the sensitive film is made with silver selenium as sensitive material. The present invention has excellent stability and reproducibility, electrode drift smaller than 4 MV after continuous measurement for 2 hr, and long electrode life.

Description

technical field [0001] The invention relates to a selective electrode for measuring selenium ions. Background technique [0002] Selenium is usually determined by spectrophotometry, fluorescence photometry, atomic absorption spectrometry and other methods. The spectrophotometric method is to add 3,3'-diaminobenzidine chromogen to the solution containing selenium to make it react with Se 4+ A yellow complex is generated, and after being extracted with an organic solvent, the absorbance of the solution is measured by spectrophotometry, and then the content of selenium in the sample to be tested is determined. This method for determining selenium can only be used for the determination of high-content components because of its low sensitivity, and the reagents used are expensive, large in dosage, and highly toxic; the fluorescence photometry uses 2,3-diaminonaphthalene as a fluorescent Reagents, measured by Se 4+ The size of the fluorescence intensity of the generated fluores...

Claims

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Application Information

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IPC IPC(8): G01N27/333
Inventor 王未肖李景印段惠敏李淑芳郭光美刘魁
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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