ASTM D7284-08e1
Historical Standard: 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
SUPERSEDED (see Active link, below)
ASTM D7284
1. Scope
1.1 This test method is used to determine the concentration of total cyanide in an aqueous wastewater or effluent. The 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 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 400 ?g/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 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 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 Note 2 and Section 9 .
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
D1129 Terminology Relating to Water
D1193 Specification for Reagent Water
D2036 Test Methods for Cyanides in Water
D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water
D3856 Guide for Management Systems in Laboratories Engaged in Analysis of Water
D5847 Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis
D6696 Guide for Understanding Cyanide Species
D6888 Test Method for Available Cyanide with Ligand Displacement and Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection
D7365 Practice for Sampling, Preservation and Mitigating Interferences in Water Samples for Analysis of Cyanide
Keywords
amperometry; cyanide; distillation; flow injection analysis; gas diffusion membrane; total cyanide;
ICS Code
ICS Number Code 13.060.50 (Examination of water for chemical substances)
DOI: 10.1520/D7284-08E01
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