ウルシをマトリックスとする沈殿分散型の塩化物イオンセンサー

概要

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The chloride ion-selective electrodes (ISE) and the chloride ion-sensitive field elfect transistor (ISFET) were prepared by using Urushi as the membrane matrix and silver chloride-silver sulfide (AgCl/Ag_2S) powder as the ion-sensing material. A linear log a_<cl>- potential curve was obtained within the chloride ion activity range from 10^4 to 1 mol dm^<-3> when the ISE membrane was composed of 65 wlw%' of AgCl/Ag_2S powder and 35 w/w% Urushi. The slope of the linear part of the log a_<cl>- potential curve was -52 mV/activity decade. However, the ISE had poor durability. When 50 w/w% of AgCl/ Ag_2S powder, 20 w/w% of trioctylmethylammoniumtetraphenyl borate (TOMA-TPB) and 30 w/w% of Urushi were used for the preparation of ISE membrane, the slope of the linear part of the log a_<cl>- Potential curve was -55 mV/ activity decade. The ISE had good durability. The ISE exhibited a constant potential within the pH range from 2.5 to 9.5. The selectivity coefficients of several anions for the ISE were measured. A chloride ISFET was also prepared by the use of the mixture of AgCl/Ag_2S, TOMA-TPB and Urushi. Good response characteristics were observed with the ISFET.
社団法人日本分析化学会の論文
1989-03-05