ISO 2613-2:2023

Analysis of natural gas — Silicon content of biomethane — Part 2: Determination of siloxane content by gas chromatography with ion mobility spectrometry

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:

—???? hexamethyldisiloxane (L2);

—???? octamethyltrisiloxane (L3);

—???? decamethyltetrasiloxane (L4);

—???? dodecamethylpentasiloxane (L5);

—???? hexamethylcyclotrisiloxane (D3);

—???? octamethylcyclotetrasiloxane (D4);

—???? decamethylcyclopentasiloxane (D5);

—???? 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 bar, temperatures of 0 °C – 40 °C and relative humidity < 90 %.

Edition	2023
Standard Part No	2
Published Date	2023
Published By	International Standardization Organisation
Page Count	10