Observations on the use of a sulfuric acid medium for As(V) to As(III) reduction in lodimetric titrations: Application to the determination of total arsenic

The use of a sulfuric rather than a hydrochloric acid medium for the reduction of As(V) to As(III) by iodide is proposed. Optimum conditions of acid concentration, amount of sodium hydroxide, and time and temperature are established to achieve quantitative reduction. The optimized reduction procedur...

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Bibliographic Details
Published in:Microchemical journal 1991, Vol.44 (2), p.179-186
Main Authors: Adelantado, J.V.Gimeno, Reig, F.Bosch, Martinez, V.Peris, Mossi, F.Bosch
Format: Article
Language:English
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Summary:The use of a sulfuric rather than a hydrochloric acid medium for the reduction of As(V) to As(III) by iodide is proposed. Optimum conditions of acid concentration, amount of sodium hydroxide, and time and temperature are established to achieve quantitative reduction. The optimized reduction procedure was applied to the iodimetric determination of total arsenic and compared to a procedure that employs a hydrochloric acid medium. A systematic error of 0.04% was found for the method with a sulfuric acid medium opposed to 0.05% for the method with a hydrochloric acid medium in the reduction step. The proposed modified iodimetric method has been successfully used with some organic samples requiring a prior destructive treatment of the organic matrix.
ISSN:0026-265X
1095-9149
DOI:10.1016/0026-265X(91)90096-8