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ASTM D 7237 : 2018

Current
Current

The latest, up-to-date edition.

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

Hardcopy , PDF

Language(s)

English

Published date

01-10-2019

This test method is used to establish the concentration of free cyanide in an aqueous wastewater, effluent and in-stream free cyanide concentrations after mixing treated water with receiving water.

1.1This test method is used to establish the concentration of free cyanide in an aqueous wastewater, effluent and in-stream free cyanide concentrations after mixing treated water with receiving water. The test conditions of this test 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 6. Free cyanide is determined at pH 6 at room temperature. The aquatic free cyanide can be determined by matching the pH to the water in the receiving environment in the range of pH 6 to 8. The extent of HCN formation is less dependent on temperature than the pH; however, the temperature can be regulated if deemed necessary for aquatic free cyanide to further simulate the actual aquatic environment.

1.2The free cyanide test method is based on the same instrumentation and technology that is described in Test Method D6888, but employs milder conditions (pH 6–8 buffer versus HCl or H2SO4 in the reagent stream), and does not utilize ligand displacement reagents.

1.3The 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.

1.4This procedure is applicable over a range of approximately 5 to 500 μg/L (parts per billion) 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 E1763 and Practice D6512 the lower scope limit was determined to be 9 μg/L for chlorinated gold leaching barren effluent water and the IQE10 % is 12 µg/L in the gold processing detoxified reverse osmosis permeate waste water sample matrix.

1.5The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.6This test method is not recommended for samples that contain reduced sulfur compounds such as sulfides.

1.7This 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in 8.6 and Section 9.

1.8This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

Committee
D 19
DocumentType
Test Method
Pages
11
PublisherName
American Society for Testing and Materials
Status
Current
Supersedes

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 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 E 1600 : 2015 Standard Test Methods for Determination of Gold in Cyanide Solutions

ASTM D 7365 : 2007 Standard Practice for Sampling, Preservation and Mitigating Interferences in Water Samples for Analysis of Cyanide
ASTM D 4841 : 1988 : R2008 Standard Practice for Estimation of Holding Time for Water Samples Containing Organic and Inorganic Constituents
ASTM D 4658 : 2003 Standard Test Method for Sulfide Ion in Water
ASTM D 1129 : 2003 Standard Terminology Relating to Water
ASTM D 4658 : 2008 Standard Test Method for Sulfide Ion in Water
ASTM D 7365 : 2009 Standard Practice for Sampling, Preservation and Mitigating Interferences in Water Samples for Analysis of Cyanide
ASTM D 4841 : 1988 : R2018 Standard Practice for Estimation of Holding Time for Water Samples Containing Organic and Inorganic Constituents
ASTM D 1129 : 2013 Standard Terminology Relating to Water
ASTM D 1129 : 2013 : R2020 Standard Terminology Relating to Water
ASTM D 2036 : 1991 Standard Test Methods for Cyanides in Water
ASTM D 5847 : 1999 : REV A : EDT 1 Standard Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis
ASTM D 6888 : 2003 Standard Test Method for Available Cyanide with Ligand Displacement and Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection
ASTM D 4658 : 2009 Standard Test Method for Sulfide Ion in Water
ASTM D 2777 : 2012 Standard Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water
ASTM D 1129 : 2013 : R2020 : EDT 2 Standard Terminology Relating to Water
ASTM D 6696 : 2016 Standard Guide for Understanding Cyanide Species
ASTM D 1193 : 1977 : R1983 : EDT 1 Standard Specification for Reagent Water
ASTM D 4841 : 1988 : R1998 Standard Practice for Estimation of Holding Time for Water Samples Containing Organic and Inorganic Constituents
ASTM D 5847 : 2002 : R2007 Standard Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis
ASTM D 2036 : 2009 : R2022 Standard Test Methods for Cyanides in Water
ASTM D 4658 : 2015 Standard Test Method for Sulfide Ion in Water (Withdrawn 2024)
ASTM D 6888 : 2016 Standard Test Method for Available Cyanides with Ligand Displacement and Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection
ASTM D 6696 : 2010 Standard Guide for Understanding Cyanide Species
ASTM D 1129 : 2006 Standard Terminology Relating to Water
ASTM D 6696 : 2014 Standard Guide for Understanding Cyanide Species
ASTM E 691 : 2020 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ASTM D 2777 : 2003 Standard Practice for Determination of Precision and Bias of Applicable Methods of Committee D-19 on Water
ASTM D 2777 : 2021 Standard Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water
ASTM D 4841 : 1988 : R2003 Standard Practice for Estimation of Holding Time for Water Samples Containing Organic and Inorganic Constituents
ASTM D 2777 : 2013 Standard Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water
ASTM D 7365 : 2009 : REV A Standard Practice for Sampling, Preservation and Mitigating Interferences in Water Samples for Analysis of Cyanide
ASTM D 4841 : 1988 : R2013 Standard Practice for Estimation of Holding Time for Water Samples Containing Organic and Inorganic Constituents
ASTM D 6696 : 2005 : EDT 1 Standard Guide for Understanding Cyanide Species
ASTM D 5847 : 2002 : R2012 Standard Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis
ASTM D 2777 : 1998 Standard Practice for Determination of Precision and Bias of Applicable Methods of Committee D-19 on Water
ASTM D 1129 : 2013 : R2020 : EDT 1 Standard Terminology Relating to Water
ASTM D 2036 : 2009 : R2015 Standard Test Methods for Cyanides in Water
ASTM D 1129 : 1999 : REV A Standard Terminology Relating to Water
ASTM D 2036 : 1998 Standard Test Methods for Cyanides in Water
ASTM E 691 : 2019 : EDT 1 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ASTM D 6888 : 2009 Standard Test Method for Available Cyanide with Ligand Displacement and Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection
ASTM D 3856 : 2011 Standard Guide for Management Systems in Laboratories Engaged in Analysis of Water
ASTM D 1129 : 2006 : REV A Standard Terminology Relating to Water
ASTM E 691 : 2023 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ASTM D 1193 : 2006 : R2011 Standard Specification for Reagent Water
ASTM E 1601 : 2019 Standard Practice for Conducting an Interlaboratory Study to Evaluate the Performance of an Analytical Method
ASTM D 6888 : 2004 Standard Test Method for Available Cyanide with Ligand Displacement and Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection
ASTM D 5847 : 2002 : R2020 Standard Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis
ASTM D 1129 : 2003 : REV A Standard Terminology Relating to Water
ASTM D 1129 : 2002 Standard Terminology Relating to Water
ASTM E 1601 : 1998 Standard Practice for Conducting an Interlaboratory Study to Evaluate the Performance of an Analytical Method
ASTM D 6696 : 2005 Standard Guide for Understanding Cyanide Species
ASTM D 1293 : 1999 Standard Test Methods for pH of Water
ASTM E 1601 : 2010 Standard Practice for Conducting an Interlaboratory Study to Evaluate the Performance of an Analytical Method
ASTM D 6888 : 2016 : R2023 Standard Test Method for Available Cyanides with Ligand Displacement and Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection
ASTM D 6512 : 2003 Standard Practice for Interlaboratory Quantitation Estimate
ASTM D 2036 : 2009 Standard Test Methods for Cyanides in Water
ASTM E 691 : 2022 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ASTM E 1763 : 2006 Standard Guide for Interpretation and Use of Results from Interlaboratory Testing of Chemical Analysis Methods (Withdrawn 2015)
ASTM D 6696 : 2016 : R2023 Standard Guide for Understanding Cyanide Species
ASTM E 691 : 2009 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ASTM D 1193 : 1991 Standard Specification for Reagent Water
ASTM D 3856 : 1995 : R2006 Standard Guide for Good Laboratory Practices in Laboratories Engaged in Sampling and Analysis of Water
ASTM D 7728 : 2018 Standard Guide for Selection of ASTM Analytical Methods for Implementation of International Cyanide Management Code Guidance
ASTM D 1293 : 1999 : R2005 Standard Test Methods for pH of Water
ASTM E 1601 : 2012 Standard Practice for Conducting an Interlaboratory Study to Evaluate the Performance of an Analytical Method
ASTM D 1129 : 2004 Standard Terminology Relating to Water
ASTM D 5847 : 2022 Standard Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis
ASTM D 2777 : 2008 Standard Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water
ASTM D 4658 : 1992 : R1996 Standard Test Method for Sulfide Ion in Water
ASTM D 3856 : 2011 : R2015 Standard Guide for Management Systems in Laboratories Engaged in Analysis of Water (Withdrawn 2024)
ASTM D 1293 : 2018 Standard Test Methods for pH of Water
ASTM E 691 : 2021 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ASTM D 2777 : 2006 Standard Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water
ASTM D 3856 : 1995 : R2000 Standard Guide for Good Laboratory Practices in Laboratories Engaged in Sampling and Analysis of Water
ASTM D 6696 : 2001 Standard Guide for Understanding Cyanide Species
ASTM D 1129 : 2002 : REV A Standard Terminology Relating to Water
ASTM D 5847 : 2002 Standard Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis
ASTM E 1763 : 1998 Standard Guide for Interpretation and Use of Results from Interlaboratory Testing of Chemical Analysis Methods
ASTM D 7365 : 2009 : REV A : R2015 Standard Practice for Sampling, Preservation and Mitigating Interferences in Water Samples for Analysis of Cyanide
ASTM D 6512 : 2007 Standard Practice for Interlaboratory Quantitation Estimate
ASTM D 1193 : 1970 Standard Specification For Reagent Water
ASTM D 4841 : 1988 : R2013 : EDT 1 Standard Practice for Estimation of Holding Time for Water Samples Containing Organic and Inorganic Constituents
ASTM D 1193 : 2006 Standard Specification for Reagent Water
ASTM D 7728 : 2011 Standard Guide for Selection of ASTM Analytical Methods for Implementation of International Cyanide Management Code Guidance
ASTM D 1293 : 2012 Standard Test Methods for pH of Water
ASTM D 1193 : 1999 Standard Specification for Reagent Water
ASTM D 1129 : 2010 Standard Terminology Relating to Water
ASTM D 2036 : 2006 Standard Test Methods for Cyanides in Water
ASTM D 1129 : 2006 : REV A : EDT 1 Standard Terminology Relating to Water
ASTM D 1129 : 2001 Standard Terminology Relating to Water
ASTM D 1129 : 2004 : EDT 1 Standard Terminology Relating to Water
ASTM D 1193 : 2006 : R2018 Standard Specification for Reagent Water
ASTM D 2777 : 2008 : EDT 1 Standard Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water
ASTM D 6512 : 2000 Standard Practice for Interlaboratory Quantitation Estimate
ASTM D 1293 : 1984 : R1990 Standard Test Methods for pH of Water
ASTM D 7365 : 2009 : REV A : R2022 Standard Practice for Sampling, Preservation and Mitigating Interferences in Water Samples for Analysis of Cyanide
ASTM D 6512 : 2007 : R2014 Standard Practice for Interlaboratory Quantitation Estimate (Withdrawn 2023)

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