Numerous papers have appeared setting forth the use of hydrogen ion apparatus in connection with water treatment or the use of water of various industries. Parker and Baylis3 have given a summary of hydrogen ion measurements as applied to potable waters. In general, it appears that hydrogen ion measurements are essential in a water purification plant, bothfor control of the factors affecting precipitation, and to secure a final product possessing the most desirable characteristics. Parker4 has described the apparatus used in experimental installations, and has shown records made during automatic control of the liming process. Control of acid treatment of zeolite-softened water has likewise been accomplished by the use of the quinhydrone electrode and a recorder-controller. It is the purpose of this paper to point out the various hydrogen ion electrodes available for use with water, and to state their characteristics and limitations very definitely. There are two possibilities in the pH measurement problem; first, measurements made intermittently by a plant chemist or operator, for control purposes, and second, continuous measurements of pH made by the use of a continuous recorder and an electrode in a flow channel. Automatic control of water treatment is a natural consequence of the second of these types of measurement. It is always well, however, to determine the exact nature of the pH measurement problem by intermittent measurements on small samples of water, before attempting
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Oct 1, 1931
C C Coons 
