ペルオキソホウ酸-ヨウ化物イオンの反応を利用したタングステン(VI)及びバナジウム(V)のヨウ化物イオン電極による接触分析

片岡 正光, 高橋 真彦, 神原 富民

doi:10.2116/bunsekikagaku.28.3_169

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タイトル別名

ペルオキソほう酸‐よう化物イオンの反応を利用したタングステン（ＶＩ）及びバナジウム（Ｖ）のよう化物イオン電極による接触分析
Application of an iodide ion-selective electrode to the kinetic determination of tungsten(VI) and vanadium (V) by their catalytic effect on the peroxoborate-iodide reaction
ペルオキソホウサンヨウカブツイオンノハンノウオリヨウシタタングス

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説明

The oxidation of iodide ion by peroxoborate ion takes place in acidic milieu and is catalyzed by a trace amount of tungsten(VI) or vanadium(V). When the concentrations of peroxoborate and sulfuric acid were kept in a large excess in comparison with that of iodide ion, the reaction rate was proportional to the product of catalyst and iodide ion concentrations. The reaction rate was followed by measuring the concentration of iodide ion by means of an iodide ion-selective electrode. The appropriate reaction conditions were decided graphically. The most suitable concentrations of sodium peroxoborate, potassium iodide and sulfuric acid for the determination of tungsten(VI) were found to be 12.5 mM, 60 μM and 75 mM, respectively, and for the determination of vanadium(V), they were 12.5 mM, 50 μM and 30 mM. A calibration curve of good linearity was obtained over concentration range 0 to 6.0 μM of tungstate. The calibration curve for orthovanadate showed also a good linearlity in the concentration range below 40 μM, but deviated at the higher concentration. However, the determination up to 100μM was feasible. Interferences of diverse ions were tested, among which Fe(III) and Mo(VI) interfered strongly.

収録刊行物

分析化学

分析化学 28 (3), 169-173, 1979

公益社団法人日本分析化学会

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