Water quality - Determination of cyanide -- Part 3: Determination of cyanogen chloride

Document Number: NL ISO 6703 3 : 2009
Sector: Food Technology
TC: No
ICS: 13.060.50
This part of ISO 6703 specifies a method for the determination of cyanides, as cyanogen chloride (see clause 2) in water. The method is applicable for the determination of cyanogen chloride concentrations in the range 0,02 to 15 mg/l. The ions and compounds listed in the table, if present singly or in combination at concentrations above the specified limiting concentration, interfere with the method (the list is not exhaustive). The presence of aldehydes, e.g. formaldehyde, may give lower cyanide values because of the formation of cyanohydrin. Table — Interferences Interference Limiting concentration mg/l Sulfide Ion 1 000 Polysulfide ion 300 Sulfide and polysulfide ion 1 000 Sulfite ion 500 Thiosulfate ion 1 000 Thiocyanate ion 1 000 Chlorine (elemental) 250