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Selenium ion selective electrode

An ion-selective, electrode-based technology, 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, short service life of electrodes, low sensitivity, etc., and achieve service life Long, reduce electrode impedance, good stability effect

Inactive Publication Date: 2005-11-09
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

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Embodiment Construction

[0009] Such as figure 1 , figure 2 Shown, the selenium ion selective electrode of the present invention comprises the electrode body that is made up of electrode cap 2, electrode rod 3 and electrode head 6, and the sensitive film 7 that embeds electrode head 6 is silver selenide with the refractory substance of selenium It is a sensitive material, which is made by grinding, sieving, and tableting. It is tightly embedded in the electrode head 6 with an adhesive. The silver wire 4 in the electrode rod 3 is directly in contact with the inner side of the sensitive membrane 7, and the membrane potential generated is passed through the silver wire. 4. The platinum wire 9 is passed to the shielding wire 1 and the shielding plug 8. The electrode rod 3 and the electrode head 6 are connected by threads, which can easily realize the replacement of the sensitive film. A sealing gasket 5 is provided at the thread connection. The selenium ion selective electrode of the present invention s...

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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. Spectrophotometry 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 fluorescent substanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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