ASTM-D4282 Historical Revision Information
Standard Test Method for Determination of Free Cyanide in Water and Wastewater by Microdiffusion

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


1.1 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.

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

1.3 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.

1.4 This test method has been fully validated by collaborative testing as specified by Practice D2777.

1.5 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.

Significance and Use

This test method is useful in distinguishing between the potentially available free cyanide (total cyanide) and the free cyanide actually present.

This test method provides a convenient technique for making on-site free cyanide determinations.


free cyanide; hexacyanoferrate; instability; microdiffusion; micropipet; pyridine-barbaturic acid; spectrophotometer; wastewater; Pyridine-barbaturic acid; Spectrophotometry; Wastewater testing/treatment; Cyanides; Diffusion; Free cyanide; Hexacyanoferrate; Instability; Microdiffusion process; Organic compounds--water; ICS Number Code 13.060.50 (Examination of water for chemical substances)

To find similar documents by ASTM Volume:

11.02 (Water (II))

To find similar documents by classification:

13.060.50 (Examination of water for chemical substances)

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Document Number


Revision Level

2002 R10 EDITION



Modification Type


Publication Date

Dec. 1, 2010

Document Type

Test Method

Page Count

6 pages

Committee Number