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  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

Ion-Selectrodes based on Calcium Ferrite

Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1992, v.5 no.4, pp.401-408
Kim, Chung-Hee
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Abstract

The ion-selectrodes based on calcium ferrite were prepared by mixing calcium oxide with ferric oxide on molar ratio of 0.6:1.4, 0.8:1.2, 1.0:1.0, respectively. The specimens were sintered at <TEX>$1400^{\circ}C$</TEX> for 2hrs in <TEX>$O_2$</TEX> and for 20min in <TEX>$H_2$</TEX> atmosphere. The selectrode sintered in hydrogen atmosphere showed better responded potential and wider range of responded concentration than selectrode sintered in oxygen atmosphere. The ion-selectrodes base on calcium ferrite(0.6:1.4 molar ratio.) showed the highest potential to bivalent cations such as <TEX>$Ca^{2+}$</TEX>, <TEX>$Ba^{2+}$</TEX>, <TEX>$Mg^{2+}$</TEX>, <TEX>$Zn^{2+}$</TEX> and halogen anions such as <TEX>$I^-$</TEX>, <TEX>$Br^-$</TEX> in the range of <TEX>$10^{-1}{\sim}10^{-7}M$</TEX>. It showed good agreement with theoretical nernstian values.

keywords
Calcium ferrite ion-selectrodes


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