ASTM D 4282 Standard Test Method for Determination of Free Cyanide in Water and Wastewater by Microdiffusion

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ASTM D 4282 Document Information:

Title
Standard Test Method for Determination of Free Cyanide in Water and Wastewater by Microdiffusion

ASTM International

Publication Date:
Jul 10, 2002

Scope:

This test method covers the determination of free cyanides in waters and wastewaters. Free cyanide is here defined as the cyanide which diffuses as cyanide (HCN), at room temperature, from a solution at pH 6.

This test method does not include complexes that resist dissociation, such as hexacyanoferrates and gold cyanide, nor does it include thiocyanate and cyanohydrin.

This test method may be applied to water and wastewater samples containing free cyanide from 10 to 150 µg/L. Greater concentrations may be determined by appropriate dilution.

This test method has been fully validated by collaborative testing as specified by Practice D 2777.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see 8.6, 8.9, Section 9, and 12.2.1.

Keywords:

free cyanide

hexacyanoferrate

instability

microdiffusion

micropipet

pyridine-barbaturic acid

spectrophotometer

wastewater

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