過マンガン酸イオンの酸化作用を利用する微量ヘキサチオン酸イオンの吸光光度定量

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タイトル別名
  • Spectrophotometric determination of micro amounts of hexathionate via permanganate reaction.
  • カマンガンサン イオン ノ サンカ サヨウ オ リヨウスル ビリョウ ヘキサチ

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抄録

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 S6O62- 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%.

収録刊行物

  • 分析化学

    分析化学 36 (7), 407-411, 1987

    公益社団法人 日本分析化学会

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