Water quality — Determination of total organic carbon (TOC), dissolved organic carbon (DOC), total bound nitrogen (TNb) and dissolved bound nitrogen (DNb) after high temperature catalytic oxidative combustion (ISO 20236:2018)
This document specifies a method for the quantitative determination of selected cyclic volatile methylsiloxanes (cVMS) in non-filtered water samples by purge and trap extraction with isotope dilution gas chromatography-mass spectrometry (GC-MS).This method is applicable to the determination of individual cVMS, including:— octamethylcyclotetrasiloxane (D4) — decamethylcyclopentasiloxane (D5) — dodecamethylcyclohexasiloxane (D6) in surface water, ground water, and wastewater. It can be applied to samples within the concentration range of 0,01 µg/ l to 1 µg/ l of each of the target compounds. Depending on the matrix, the method may also be applicable to higher concentrations ranging from 1 µg/ l to 100 µg/ l after suitable dilution of the sample or reduction in sample size.
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