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ASTM D 7237 : 2006



A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Standard Test Method for Aquatic Free Cyanide with Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection

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1.1 This test method is used to establish the concentration of aquatic "free" cyanide in an aqueous wastewater or effluent. The test conditions of this method are used to measure free cyanide (HCN and CN-) and cyanide bound in the metal-cyanide complexes that are easily dissociated into free cyanide ions at the pH of the aquatic environment ranging from pH 6 to pH 8. The extent of HCN formation is less dependent on temperature than the pH; however, the temperature can be regulated if deemed necessary to further simulate the actual aquatic environment.

1.2 The aquatic free cyanide method is based on the same instrumentation and technology that is described in standard test method D 6888, but employs milder conditions (pH 6-8 buffer versus HCl in the reagent stream), and does not utilize ligand displacement reagents.

1.3 The aquatic free cyanide measured by this procedure should be similar to actual levels of HCN in the original aquatic environment. This in turn may give a reliable index of toxicity to aquatic organisms.

1.4 This procedure is applicable over a range of approximately 2 to 500 g/L (parts per billion) aquatic free cyanide. Sample dilution may increase cyanide recoveries depending on the cyanide speciation; therefore, it is not recommended to dilute samples. Higher concentrations can be analyzed by increasing the range of calibration standards or with a lower injection volume. In accordance with Guide E 1763 and Practice D 6512 the lower scope limit was determined to be 9 g/L for chlorinated gold leaching barren effluent water.

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. Specific hazard statements are given in Section and Section .

D 19
Test Method
American Society for Testing and Materials

ASTM D 7728 : 2018 Standard Guide for Selection of ASTM Analytical Methods for Implementation of International Cyanide Management Code Guidance
ASTM D 7365 : 2009 : REV A : R2015 Standard Practice for Sampling, Preservation and Mitigating Interferences in Water Samples for Analysis of Cyanide
ASTM E 2242 : 2013 Standard Test Method for Column Percolation Extraction of Mine Rock by the Meteoric Water Mobility Procedure
ASTM D 6696 : 2016 Standard Guide for Understanding Cyanide Species
ASTM D 7572 : 2015 Standard Guide for Recovery of Aqueous Cyanides by Extraction from Mine Rock and Soil
ASTM D 4193 : 2008 : R2013 : EDT 1 Standard Test Method for Thiocyanate in Water
ASTM E 1600 : 2015 Standard Test Methods for Determination of Gold in Cyanide Solutions

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