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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,
C.
(1992). Ion-Selectrodes based on Calcium Ferrite. Analytical Science and Technology, 5(4), 401-408.
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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.
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- Calcium ferrite ion-selectrodes
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