Application of the silver amalgam electrode for the microdetermination of phosphate, arsenate, and sulfide

The silver amalgam electrode can be used efficiently as an indicator electrode for silver ion and in argentimetry. It was tested for the argentimetric determination of iodide ion. The potential changes of this electrode during the reaction of silver ions with iodide were theoretically explained and...

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Bibliographic Details
Published in:Microchemical journal 1990-06, Vol.41 (3), p.356-361
Main Authors: Zayed, M.A., El-Dien, F.A.Nour, Hegazy, W.H.
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Electrochemical methods
Exact sciences and technology
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Summary:The silver amalgam electrode can be used efficiently as an indicator electrode for silver ion and in argentimetry. It was tested for the argentimetric determination of iodide ion. The potential changes of this electrode during the reaction of silver ions with iodide were theoretically explained and agree well with those measured. The titration of silver ion with iodide is preferable over the reverse. This electrode was used in the microdetermination of phosphate, arsenate, and sulfide by formation of their silver precipitates and titration of excess silver with iodide in the absence of these precipitates. Comparison is made between the argentimetric and mercurimetric determinations of phosphate, arsenate, and sulfide.
ISSN:0026-265X
1095-9149
DOI:10.1016/0026-265X(90)90140-Z