Measurement of and Effect of Temperature on Electrical Resistance of Glass Electrodes

Abstract

The apparent irregularities observed in measuring the electrical resistance of glass electrodes, as reported in the literature, are explained by the dielectric properties of glass. The use of d.c. is recommended, and the need for caution in the use of a.c. is indicated. An experimental technique is described which hastens the measurement with d.c. when dielectric absorption is bothersome. An experimental study is reported dealing with the effect of temperature on the resistance of glass electrodes, including ones of Corning 015 glass and others made from three newer pH‐responsive glasses. The experimental results do not agree with previously employed equations. The Rasch and Hinrichsen relationship, , in which the logarithm of the resistance varies linearly with the reciprocal of the absolute temperature, is preferred. A nomograph is given for the glasses studied. The temperature‐resistance behavior of Corning 015 glass is mathematically the same for membranes immersed in solution and for the dry glass at elevated temperatures.