This International Standard specifies a method for the determination of the following six water-soluble organic complexing agents in the concentration range from 0,5 micrograms/litre to 200 micrograms/litre: EDTA (ethylenedinitrilotetraacetic acid); NTA (nitrilotriacetic acid); DTPA (diethylenetrinitrilopentaacetic acid); MGDA (methylglycinediacetic acid); ß-ADA (ß-alaninediacetic acid); 1,3-PDTA (1,3-propylenedinitrilotetraacetic acid). The method is applicable to drinking, ground, surface and waste water.
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Foreword
Introduction
1 Scope
2 Normative references
3 Principle
4 Interferences
5 Reagents
6 Apparatus
7 Sampling and sample stabilization
8 Procedure
8.1 Sample pretreatment
8.2 Esterification of the sample
8.3 Gas-chromatographic determination
8.4 Identification of the complexing agents
8.5 Blank determination
9 Calibration
9.1 Preparation of calibration solutions
9.2 Calibration with internal standard or control standard
9.3 Calculation
10 Expression of results
11 Test report
Annex A Examples of columns, chromatograms and mass spectra (informative)
ISO 3696:1987 Water for analytical laboratory use -- Specification and test methods
ISO 5667-1:1980 Water quality -- Sampling -- Part 1: Guidance on the design of sampling programmes
ISO 5667-2:1991 Water quality -- Sampling -- Part 2: Guidance on sampling techniques
ISO 3696:1987 Water for analytical laboratory use -- Specification and test methods
ISO 5667-1:1980 Water quality -- Sampling -- Part 1: Guidance on the design of sampling programmes
ISO 5667-2:1991 Water quality -- Sampling -- Part 2: Guidance on sampling techniques