Advisor

David K. Roe

Date of Award

11-27-1974

Document Type

Thesis

Degree Name

Master of Science (M.S.) in Chemistry

Department

Chemistry

Physical Description

1 online resource (vi, 40 pages)

Subjects

Ion selective electrodes, Arsenic, Electrochemical analysis

DOI

10.15760/etd.2117

Abstract

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.

Persistent Identifier

http://archives.pdx.edu/ds/psu/13258

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