Undersökning av vatten efter kemiska substanser

Kommittébeteckning: SIS/TK 424 (Kemiska vattenundersökningar)
Källa: ISO
Svarsdatum: den 13 aug 2019
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This document specifies a multi-parameter method for the determination of total organic carbon (TOC), total nitrogen (TN) and total phosphorus (TP) in drinking water, raw water, ground water, surface water, sea water, saline water, process water, wastewater and industrial wastewater applications, after a chemical oxidation process. It is applicable to both dissolved and bound to suspended materials.

The method allows for determination of TOC ≥ 1 mg/l, TN ≥ 1 mg/l and TP ≥ 1 mg/l. The lower and upper working ranges are restricted by instrument-dependent conditions (for example sample volume, reaction chemistry amounts) and can be adjusted for a wider range.

The analysis procedure is carried out instrumentally by a single oxidation process under standard temperature and pressure.

Dissolved nitrogen gas is not included in the TN measurement in this method. Depending on the analysis conditions and when present in the sample, certain portion of elemental carbon, cyanide and cyanate can be included in the TOC result.

NOTE The method can be applied for the determination of total carbon (TC) and total inorganic carbon (TIC). Volatile or purgeable organic carbon (VOC, POC) can be determined separately by this method (see Annex A).

Kommittébeteckning: SIS/TK 424 (Kemiska vattenundersökningar)
Källa: ISO
Svarsdatum: den 18 aug 2019
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This document specifies operationally defined methods for the determination of available total cyanide in various types of water such as drinking water, ground water, surface water, wastewaters, metallurgical processing tailings reclaim solution, heap leach barren solution, mill slurry tailings filtrate 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 extended by reducing the sensitivity (Figure A.1.).

NOTE ISO 2080:2008, 3.105, defines free cyanide. The concentration of available total cyanide includes free cyanide and cyanide complexed in solution with cyanide anion, but not necessarily all of the metal cyanide complexes present as determined by a specified analytical method (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.