Abstract
Abstract Ion chromatography (IC) for the separation and determination of the cyanide ion and metal cyanide complexes is reviewed. The United States Environmental Protection Agency (USEPA) classifies cyanides as hazardous substances, hazardous waste constituents and priority toxic pollutants. IC is a reliable analytical technique that is not affected by the high salt concentration typical of process and environmental samples. The technique of IC is routinely used for the analysis of wastewater, soils and sediments, plating solutions and hydrometallurgical effluent for cyanides and other ions. IC provides knowledge of all cyanide species, free and complexed (to metal) and conveniently provides speciation information for different oxidation states, for example, iron II and III, and gold I and III cyanide complexes. This obviates the necessity for distillation to convert metal cyanide species to hydrogen cyanide for determination of total cyanide. Detection limit ranging down to 1μg/L CN− and 5üg/L Au(CN)2 −, without preconcentration, have been reported.
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