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박면용 ( Myon Yong Park ),이명재 ( Myung Jae Lee ),조동회 ( Dong Hoe Cho ),원층택 ( Chung Taik Won ) 건국대학교 기초과학연구소 1992 理學論集 Vol.17 No.-
The ion-selective electrode based on ferric oxide and calcium ferrite have been studied to ionic sensitivities, selectivities and response behaviors in aqueous solution. The membrane selectrode of ferric oxide was prepared by using a-ferric hydroxide from ferric nitrate solution at pH 4.5~6.0. The membrane were sintered at 1,200℃ and 1,350℃. Calcium ferrite was prepared by mixing ferric oxide with calcium oxide on molar ratio of 0.8: 0.2 and the selectrode membrane based on calcium ferrite was sintered at 1,100℃. Membrane seletrode of ferric oxide was responded without any selectivity to Ag+, Ni2+, Ca2+, Bi3+, Ci-, HCO3-, CIO4,- and NO3-ion. Membrane seletrode of calcium ferrite responded except sensitivity to Ag+, Be2+, Cu2+, Cr3+, Bi3+, HCO3-, CO32-, and S2-, but their sensitivities were agreed with Nernstain slope. The selectrode of calcium ferrite was shown reproducible potential response to ions in the solution for six months.