This test method determines total cyanide in solid waste and/or soil samples. The sample is extracted at a highly alkaline pH and the extracted cyanide is determined by Segmented Flow Injection, In-Line UV Digestion and Gas Diffusion Amperometric Detection. The 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 but with the UV digestion turned off.
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 measures cyanide by a flow injection gas diffusion amperometric 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