Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Simultaneous Spectrophotometric Determination of Traces of Bromide and Iodide Based on Their Catalytic Effects on Pyrocatechol Violet-Hydrogen Peroxide Reaction
Norinobu YONEHARATetsuya YAMANETakashi TOMIYASUHayao SAKAMOTO
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1989 Volume 5 Issue 2 Pages 175-179

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Abstract

A kinetic method is presented for the simultaneous determination of bromide and iodide based on the different catalytic behaviors during the oxidation of Pyrocatechol Violet by hydrogen peroxide in strongly acidic solution. The reaction is monitored spectrophotometrically at 492nm. The slope and the intercept at t=0 of the second-order plot are the parameters for the determination of iodide and bromide, respectively, which are simultaneously obtained by a single kinetic run. Mixture of these anions, in the ranges 0.01-0.1mg I-′ bromide and 0.005-0.05mg 1-′ iodide, can be determined within an error of ca .10%

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© The Japan Society for Analytical Chemistry
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