12-ヒドロキシステアリン酸をマトリックスとした塩化物イオン及び硝酸イオン電極(<特集>センサー)

概要

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Chloride ion and nitrate ion selective electrodes (ISEs) were prepared by using 12-hydroxyoctadecanoic acid (12-HOA) as the membrane matrix, trioctylmethyl ammonium salts (chloride or nitrate) as the ion-sensing material and nitrophenyl octyl ether as the solvent mediator. A linear log α_<Cl^<->>-potential curve was obtained within the chloride ion activity range from 10^<-4> to 10^<-1> mol dm^<-3> ; the slope was 52mV decade^<-1> when the ISE membrane was composed of 4.1 w/w% of 12-HOA and 41 w/w% of chloride ion-sensing material. A linear log α_<NO_3^<->>-potential curve was obtained within the nitrate ion activity range from 3×10^<-5> to 10^<-1> mol dm^<-3> ; the slope was 53 mV decade^<-1> when the ISE membrane was composed of 4.1 w/w % of 12-OHA and 42 w/w % of nitrate ion-sensing material. The ISEs exhibited a constant potential within the pH range from 3.5 to 9.5. The selectivity coefficients of the ISEs for several anions were measured.
社団法人日本分析化学会の論文
1990-11-05