This guide describes methods for the extraction of total, and available cyanide in solid waste and/or soil samples. The sample is extracted at a highly alkaline pH and the extracted cyanide is determined by appropriate ASTM test methods. The extrsaction method quantitatively recovers all inorganic cyanide compounds including metal-metal cyanide complexes such as Prussian Blue. Available cyanide complexes can be determined from the same extraction.
Current cyanide methods for total cyanide in solid waste rely on a preliminary acid distillation followed by titration or colorimetric tests. Acid distillations do not quantitatively recover the strong metal metal cyanide complexes. The USEPA has ruled that strong metal metal cyanide complexes are included in the definition of total cyanide, therefore, the results based on preliminary acid distillation are biased low. This standard will rapidly and quantitatively extract all inorganic cyanide complexes including those not quantitatively recovered by distillation. The standard then allows measurement of cyanide by any ASTM standard test method. Elimination of distillation shortens analysis times allowing more samples to be tested per day and lowering the cost of analysis.
Keywordstotal cyanide, available, cyanide, free cyanide, Berlin Blue, FFC, solid waste, RCRA, weak and dissociable cyanide, strong metal cyanide complexes, insoluble cyanide, colloidal cyanide
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development