ABSTRACT
Official methods issued by the Department of the Environment UK1 describe various methods for the determination of chloride in sewage and trade effluents and waters. These methods are silver nitrate titration with chromate indicator (Mohr’s method), mercuric nitrate titration with diphenyl-carbazone indicator, potentiometric titration with silver nitrate and an automated mercuric-ferric thiocyanate colorimetric method. With one or other of these methods concentrations from 1 to 1000 mg l−1 chloride may be determined. Brief notes are given in respect of the chloride ion-selective electrode, silver coulometry and ion chromatography, the latter being relevant at very low concentrations down to the µ g l−1 level.
