ヘキサフルオロヒ酸(V)イオン電極の試作とその性能

概要

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A hexafluoroarsenate(V) ion selective PVC membrane electrode based on an ion pair of a lipophilic quaternary ammonium-hexafluoroarsenate is described. Three hexafluoroarsenate salts of tetradodecylammonium (TDA), triheptyldodccylammonium and tsrioctylmethylammonium ions are evaluated as an anion-exthange site. The TDA salt is estimated to give the best sensitivity. The linear response range of the electrode with a PVC membrane containing TDA-hexafluoroarsenate and di-2-(ethylhexyl)phthalate as a solvent mediator is from 10^<-7>M down to 10^<-7>M with a slope of 57-58 mV/decade at pH 2-12. The detection limit is 4X10^<-8>M. The selectivity coefficients of the electrode for anions are determined by the mixed solution method. The electrode based on TDA-hexafluoroarsenate is superior with respects to sensitivity and selectivity to that based on tetradecylphosphonium-hexafluoroarsenate.
社団法人日本分析化学会の論文
1989-06-05