1 Scope
This document describes a gas chromatography – ion mobility spectroscopy (GC-IMS) method for the determination of the concentration of siloxanes in biomethane. The
method is applicable to the following siloxanes:
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— hexamethyldisiloxane (L2);
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— octamethyltrisiloxane (L3);
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— decamethyltetrasiloxane (L4);
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— dodecamethylpentasiloxane (L5);
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— hexamethylcyclotrisiloxane (D3);
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— octamethylcyclotetrasiloxane (D4);
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— decamethylcyclopentasiloxane (D5);
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— dodecamethylcyclohexasiloxane (D6).
This document describes suitable calibration and measurement strategies to quantify
siloxanes in (bio)methane around and above the 0,3 mg m-3 (14 µmol mol-1) level and applies to analyses within absolute pressure ranges of 1 bar – 2 bar1, temperatures of 0 °C – 40 °C and relative humidity < 90 %.