This International Standard specifies a CFA method for the determination of sulfate in various types of water (such as ground water, drinking water and waste water).The method is applicable to samples with a sulfate (SO4) mass concentration from 30 mg/l to 300 mg/l. Other concentration ranges are applicable, provided they cover exactly one decade of concentration units (e.g. 100 mg/l to 1 000 mg/l).