Abstract
AbstractGlass electrodes with linear temperature characteristics are described. By use of a Ag‐AgBr inner reference element and an inner reference solution containing a zwitterionic buffer (MOPS), an electrode is obtained that almost has the ideal characteristics of isopotential pH (pHiso = 7) and zeropoint pH (pH0 = 7) necessary for use with the temperature compensation circuits on most pH meters. A conventional Ag‐AgCl (3 M KCl) external reference electrode is used. Excellent linearity of changes in standard potential has been observed in the range tested (5 to 65°C), and the slope factor, thermal hysteresis, and speed of response to temperature change are as good as for commercially available electrodes. The application of electrodes with these characteristics should improve the accuracy of temperature compensation in industrial and environmental measurements. Other inner‐reference electrodes and buffers are considered.
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