Three methods for up to 50 mg/l: a photometric method with pyridine/barbituric acid, a titrimetric method using the Tyndall effect and a titrimetric method using an indicator.
BS 6068-2.18:1986 history
0000 BS 6068-2.18:1986(2011)
1986BS 6068-2.18:1986 Water quality - Physical, chemical and biochemical methods - Methods for the determination of easily liberatable cyanide