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NBN ISO 20596-2:2021
Water quality — Determination of cyclic volatile methylsiloxanes in water — Part 2: Method using liquid-liquid extraction with gas chromatography-mass spectrometry (GC-MS)
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Summary
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 13
C-labeled cVMS as internal standards. The extract is
then analysed by gas chromatography-mass spectrometry (GC-MS).
NOTE Using the 13
C-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 CASa -RN
Octamethylcyclotetrasiloxane C8
H24
O4
Si4
D4 556-67-2
Decamethylcyclopentasiloxane C10
H30
O5
Si5
D5 541-02-6
Dodecamethylcyclohexasiloxane C12
H36
O6
Si6
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.
in environmental water samples with low density polyethylene (LDPE) as a preservative and subsequent
liquid-liquid extraction with hexane containing 13
C-labeled cVMS as internal standards. The extract is
then analysed by gas chromatography-mass spectrometry (GC-MS).
NOTE Using the 13
C-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 CASa -RN
Octamethylcyclotetrasiloxane C8
H24
O4
Si4
D4 556-67-2
Decamethylcyclopentasiloxane C10
H30
O5
Si5
D5 541-02-6
Dodecamethylcyclohexasiloxane C12
H36
O6
Si6
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.
Technical characteristics
| Publisher | Bureau de Normalisation Belge (NBN) |
| Publication Date | 06/24/2021 |
| Page Count | 13 |
| EAN | --- |
| ISBN | --- |
| Weight (in grams) | --- |
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