A potentiometric method for the determination of chloride in boiler waters in the range 0·1 to 10 µg ml–1 of chloride

A potentiometric method for determining chloride in boiler water has been developed, which is based on the potential of a silver-silver chloride wire electrode versus a mercury(I) sulphate reference electrode immersed in a buffered solution of the sample. The method was tested in the range 0·1 to 10·0 µg ml–1 of chloride and the standard deviations of the results at 0·1, 1·76 and 10·0 µg ml–1 of chloride were approximately 0·04, 0·06 and 0·2 µg ml–1 of chloride, respectively. Substances normally present in boiler water do not interfere appreciably but the method is not suitable if octadecylamine is present.