Portland State University. Department of Chemistry
David K. Roe
Term of Graduation
Date of Publication
Master of Science (M.S.) in Chemistry
Ion selective electrodes, Arsenic
1 online resource (40 pages)
The object of this research was to develop an arsenic(V) selective electrode. The electrode is based on a solid state membrane prepared by pressing a precipitate of silver arsenate-silver sulfide into a pellet. After the electrode was made, experiments were designed to check for three general characteristics of the electrodes: dependence of potential on pH for constant arsenic(V) concentration; dependence of potential on arsenic(V) concentrations at constant pH and extent of interference due to phosphate and arsenic(III) ions. From these measurements, it was found that Ag2HAs04 was formed originally in the membranes containing a small fraction of arsenic(V) and that this compound was converted to Ag3As04 on the electrode surface in alkaline solutions.
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Kang, Sandra Gee, "The Development of an Arsenic(V) Selective Electrode" (1974). Dissertations and Theses. Paper 2119.