Water quality. Determination of cyclic volatile methylsiloxanes in water - Method using liquid-liquid extraction with gas chromatography-mass spectrometry (GC-MS)

Water quality. Determination of cyclic volatile methylsiloxanes in water - Method using liquid-liquid extraction with gas chromatography-mass spectrometry (GC-MS)

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1   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 hexane containing 13C-labeled cVMS as internal standards. The extract is then analysed by gas chromatography-mass spectrometry (GC-MS).

NOTE Using the 13C-labeled, chemically identical substances as internal standards with the same properties as the corresponding analytes, minimizes possible substance-specific discrimination in calibrations. Since these substances are least soluble in water, they are introduced via the extraction solvent hexane into the system.

This document is applicable to the measurement of the following cVMS in rivers, streams, and waste water (influent and effluent):
Table 1 — Analytes determined by this method
Analyte Formula Abbreviation CAS a -RN
Octamethylcyclotetrasiloxane C8H24O4Si4 D4 556-67-2
Decamethylcyclopentasiloxane C10H30O5Si5 D5 541-02-6
Dodecamethylcyclohexasiloxane C12H36O6Si6 D6 540-97-6
a CAS-RN Chemical Abstracts Services Registration Number
This method can be used to determine cVMS from 0,1 µg/l to 250 μg/l. In well controlled laboratory environments, where contamination is minimized, the lower end of the application range can be diminished by a factor of up to 10.