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 %.
| SDO | ISO: International Organization for Standardization | 
| Document Number | ISO 2613 | 
| Publication Date | Not Available | 
| Language | en - English | 
| Page Count | |
| Revision Level | |
| Supercedes | |
| Committee | ISO/TC 193/SC 1 |