This International Standard specifies methods for the determination of cyanide in various types of water (such as ground, drinking, surface, leachate and waste water) with cyanide concentrations usually above 3 µg/l expressed as cyanide ions.The CFA method is applicable to a mass concentration range from 10 µg/l to 100 µg/l.The range of application may be changed by varying the operation conditions. NOTE Seawater may be analyzed with changes in sensitivity and adaptation of the reagent and calibration solutions to the salinity of the samples.