In the present work, pH response glasses with excellent chemical durability and small resistance were fabricated, the when lithium concentration in a glass membrane increased, and rare earth metal (Sc, Y and La) oxides were added in the glass. We tried to construct a pH electrode with fabricated pH response glasses, and to evaluate it for the sensitivity, linearity, alkali error and response of tap water. Next, we prepared pH electrode capable of measuring a micro volume (50 μL) by using the optimum pH response glasses. The performance results of the developed pH electrode for a micro volume that satisfied the standard JIS. The developed pH electrode may become commercially available.
