Spectrophotometric determination of micro amounts of hexathionate via permanganate reaction.

MIURA Yasuyuki, TATEGAMI Kohji, KOH Tomozo

doi:10.2116/bunsekikagaku.36.7_407

A method has been developed for the determination of micro amounts of hexathionate. It is based on the reaction of hexathionate with a given amount of permanganate in a dilute sulfuric acid medium and on the spectrophotometric measurement of iodine (as triiodide), which is formed by the oxidation of iodide with an excess of permanganate. When the mixture of 1.5 ml of 1 M sulfuric acid, 4 ml of 2 × 10^-4 M permanganate and 10 ml of hexathionate solution was allowed to stand for 20 min at temperatures ranging from 5 to 40°C, 2 mol of hexathionate was oxidized stoichiometrically with 9 mol of permanganate. The present method could be successfully applied to a determination of hexathionate in the range from 1.8 × 10^-7 to 1.1 × 10^-5 M (0.531.7 μg S₆O₆^2- in 10 ml) and gives a higher sensitivity than any previous method without solvent extraction. From eleven measurements for 10 ml of sample solution containing 5.00 × 10^-2μmol of hexathionate, the mean value was 5.02 × 10^-2 μmol with a standard deviation of 3.2 × 10^-4 μmol and a relative standard deviation of 0.63%.

Spectrophotometric determination of micro amounts of hexathionate via permanganate reaction.

Bibliographic Information

Search this article

Description

Journal

Citations (1)*help

Keywords

Details 詳細情報について

Export

Report a problem