1.1 ,This practice is used for the determination of total or available cyanide in solid waste, sediment and soil samples after alkaline extraction. Simple cyanide (CN^-) salts of group 1 and group 2 (alkali and alkaline earth) metals, soluble alkali and alkaline earth salts of zinc, copper, cadmium, mercury, nickel, silver, and iron cyanide complexes, and insoluble metal-metal cyanide complexes, such as Prussian blue, are quantitatively recovered. Gold, platinum group metals and cobalt cyanide complexes are not recovered during analysis.