• ASTM D 7237 : 2006

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Standard Test Method for Aquatic Free Cyanide with Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection

    Available format(s):  Hardcopy, PDF

    Superseded date:  11-11-2014

    Language(s):  English

    Published date:  02-01-2006

    Publisher:  American Society for Testing and Materials

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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 .

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    Committee D 19
    Document Type Test Method
    Publisher American Society for Testing and Materials
    Status Superseded
    Superseded By

    Standards Referenced By This Book - (Show below) - (Hide below)

    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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