ISO 20950-1:2018 PDF

Scope: 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 2000 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 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 2000 mg/l are described.

ISO 20950-1:2018 Referenced Document

ASTM D6888-16 Standard Test Method for Available Cyanides with Ligand Displacement and Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection*， 2024-04-20 Update
ASTM D7728-11 Standard Guide for Selection of ASTM Analytical Methods for Implementation of International Cyanide Management Code Guidance*， 2024-04-20 Update
ISO 17690:2015 Water quality - Determination of available free cyanide (pH 6) using flow injection analysis (FIA), gas-diffusion and amperometric detection
ISO 2080:2008 Metallic and other inorganic coatings - Surface treatment, metallic and other inorganic coatings - Vocabulary
ISO 3696:1987 Water for analytical laboratory use; Specification and test methods
ISO 5667-3:2012 Water quality - Sampling - Part 3: Preservation and handling of water samples
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 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
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

2018 ISO 20950-1:2018 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