Selenium ion selective electrode

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...

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

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