ASTM D7284-20
Standard Test Method for Total Cyanide in Water by Micro Distillation followed by Flow Injection Analysis with Gas Diffusion Separation and Amperometric Detection

Standard No.

ASTM D7284-20

Release Date

2020

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D7284-20

Scope

1.1 This test method is used to determine the concentration of total cyanide in an aqueous wastewater or effluent. This test method detects the cyanides that are free (HCN and CN– ) and strong-metal-cyanide complexes that dissociate and release free cyanide when refluxed under strongly acidic conditions. 1.2 This test method may not be applicable to process solutions from precious metals mining operations. 1.3 This procedure is applicable over a range of approximately 2 to 500 µg/L (parts per billion) total cyanide. Higher concentrations can be measured with sample dilution or lower injection volume. 1.4 The determinative step of this test method utilizes flow injection with amperometric detection based on Test Method D6888. Prior to analysis, samples must be distilled with a micro-distillation apparatus described in this test method or with a suitable cyanide distillation apparatus specified in Test Methods D2036. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 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, 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. 1.7 This 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.

ASTM D7284-20 Referenced Document

• ASTM D1129 Standard Terminology Relating to Water
• ASTM D1193 Standard Specification for Reagent Water
• ASTM D2036 Standard Test Methods for Cyanides in Water
• ASTM D2777 Standard Practice for Determination of Precision and Bias of Applicable Methods of Committee D-19 on Water
• ASTM D3856 Standard Guide for Good Laboratory Practices in Laboratories Engaged in Sampling and Analysis of Water
• ASTM D5847 Standard Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis
• ASTM D6696 Standard Guide for Understanding Cyanide Species*， 2023-11-15 Update
• ASTM D6888 Standard Test Method for Available Cyanides with Ligand Displacement and Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection*， 2023-11-15 Update
• ASTM D7365 Standard Practice for Sampling, Preservation and Mitigating Interferences in Water Samples for Analysis of Cyanide*， 2022-05-01 Update
• ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

ASTM D7284-20 history

• 2020 ASTM D7284-20 Standard Test Method for Total Cyanide in Water by Micro Distillation followed by Flow Injection Analysis with Gas Diffusion Separation and Amperometric Detection
• 2017 ASTM D7284-13(2017) Standard Test Method for Total Cyanide in Water by Micro Distillation followed by Flow Injection Analysis with Gas Diffusion Separation and Amperometric Detection
• 2013 ASTM D7284-13 Standard Test Method for Total Cyanide in Water by Micro Distillation followed by Flow Injection Analysis with Gas Diffusion Separation and Amperometric Detection
• 2008 ASTM D7284-08e1 Standard Test Method for Total Cyanide in Water by Micro Distillation followed by Flow Injection Analysis with Gas Diffusion Separation and Amperometric Detection
• 2008 ASTM D7284-08 Standard Test Method for Total Cyanide in Water by Micro Distillation followed by Flow Injection Analysis with Gas Diffusion Separation and Amperometric Detection