OBSERVATIONS ON THE USE OF A SULFURIC-ACID MEDIUM FOR AS(V) TO AS(III) REDUCTION IN IODIMETRIC TITRATIONS - APPLICATION TO THE DETERMINATION OF TOTAL ARSENIC

被引:1
作者
ADELANTADO, JVG
REIG, FB
MARTINEZ, VP
MOSSI, FB
机构
[1] Department of Analytical Chemistry, Faculty of Chemistry, University of Valencia, 46100 Burjasot, Valencia
关键词
D O I
10.1016/0026-265X(91)90096-8
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
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. © 1991.
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页码:179 / 186
页数:8
相关论文
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