ISO: ISO/DIS 20596-2 Water quality — Determination of cyclic volatile methylsiloxanes in water — Part 2: Method using liquid-liquid extraction with gas chromatography-mass spectrometry (GC-MS)
Introduction
The method described in this document uses low density polyethylene to prevent volatilization of samples during transit and storage. The samples are processed using a liquid-liquid extraction into a non-polar solvent with subsequent injection onto a gas chromatograph-mass spectrometer for separation and quantitation.
Scope
This document specifies a method for the determination of certain cyclic volatile methylsiloxanes (cVMS) in environmental water samples with low density polyethylene (LDPE) as a preservative and subsequent liquid-liquid extraction with a stable isotope solution. The extract is then analysed by gas chromatography-mass spectrometry (GC-MS).
This document is applicable to the measurement of the following cVMS in rivers, streams, ground water, and waste water (influent and effluent):
Analytes determined by this method:
Octamethylcyclotetrasiloxane
Decamethylcyclopentasiloxane
Dodecamethylcyclohexasiloxane
This method can be used to determine cVMS from 0,050 µg/l to 250 μg/l.
