Li_2O-Y_2O_3-SiO_2系ガラスを用いた全固体型pH電極

概要

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A new type solid-state electrode was investigated for the monitoring of pH in water at 25℃. The cell consists of two half-cells: working electrode using the glass of Li_2O-Y_2O_3-SiO_2 system (Li_xYSi_4O_<9.5+x/2>, x=2-6) and an Ag/AgCl electrode coated with Nafion film. For glasses of Li_xYSi_4O_<9.5+x/2>, the conductivity was the highest when x is equal to 5. A stable Nafion film was obtained by heat treatment at 100℃ for 1h. The electromotive force (EMF) of the cell decreased linearly with pH increase in water in accordance with the Nernst's equation. The sensitivity of the cell against pH in water was the highest when x is equal to 4. The EMF was also scarcely influenced in the presence of inorganic ions such as Na^+ and Cl^-. It was practically confirmed by the pH titration that the solid-state cell behaved similarly to the pH meter with a conventional glass electrode.
2005-08-01