ISO 20950-1:2018
Current
The latest, up-to-date edition.
Water quality — Determination of available weak and dissociable (WAD) cyanide — Part 1: Method using ligand exchange, flow injection analysis (FIA), gas-diffusion and amperometric detection
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17-05-2018
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This document specifies operationally defined methods for the determination of available WAD cyanide in various types of water such as drinking, ground, and surface, waters, and metallurgical processing tailings reclaim, heap leach barren, mill slurry tailings and leaching solutions, with cyanide concentrations from 5 µg/l to 2 000 mg/l expressed as cyanide ions in the undiluted sample. The range of application can be changed by varying the operation conditions, e.g. by using a different injection volume, thicker membrane, detector response, etc.
NOTE ISO 2080:2008, 3.105, defines free cyanide. The concentration of available WAD cyanide includes free cyanide and some of the metals complexed in solution as determined by a specified analytical method but not all of the metal complexes present in total cyanide (3,191).
In this method, six suitable mass concentration ranges from 5 µg/l to 50 µg/l, from 50 µg/l to 500 µg/l, from 0,5 mg/l to 5 mg/l, from 5 mg/l to 50 mg/l, from 50 mg/l to 500 mg/l and from 500 mg/l to 2 000 mg/l are described.
| Committee |
ISO/TC 147/SC 2
|
| DevelopmentNote |
Supersedes ISO/DIS 20950-1. (05/2018)
|
| DocumentType |
Standard
|
| Pages |
17
|
| PublisherName |
International Organization for Standardization
|
| Status |
Current
|
| Standards | Relationship |
| BS ISO 20950-1:2018 | Identical |
| ISO 2080:2008 | Metallic and other inorganic coatings Surface treatment, metallic and other inorganic coatings Vocabulary |
| ISO 17690:2015 | Water quality Determination of available free cyanide (pH 6) using flow injection analysis (FIA), gas-diffusion and amperometric detection |
| ISO 5667-3:2012 | Water quality Sampling Part 3: Preservation and handling of water samples |
| ISO 8466-2:2001 | Water quality — Calibration and evaluation of analytical methods and estimation of performance characteristics — Part 2: Calibration strategy for non-linear second-order calibration functions |
| ISO/TR 19588:2017 | Background information and guidance on environmental cyanide analysis |
| ISO 5725-2:1994 | Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method |
| ISO 3696:1987 | Water for analytical laboratory use — Specification and test methods |
| ISO 8466-1:1990 | Water quality Calibration and evaluation of analytical methods and estimation of performance characteristics Part 1: Statistical evaluation of the linear calibration function |
| ASTM D 7728 : 2011 | Standard Guide for Selection of ASTM Analytical Methods for Implementation of International Cyanide Management Code Guidance |
| ASTM D 6888 : 2016 : REDLINE | Standard Test Method for Available Cyanides with Ligand Displacement and Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection |
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