Analysis of BTEX and Siloxanes on Micro GC Fusion

Analysis of BTEX and siloxanes on Micro GC.
Green gas, biogas, biomethane, synthesis gas or syngas from fermentation or pyro-gasification in particular can contain a significant amount of impurities.

Depending on the sources recovered by these processes, impurities such as BTEX and siloxanes must be eliminated before use. Indeed, these compounds can have harmful effects on infrastructures or pose health problems due to their toxicity.

The Micro GC Fusion integrates column temperature programming for each module. Moreover, it does not present any cold point which favors the analysis of organic volatile compounds.

This application note illustrates the ability of the Micro GC Fusion to analyze BTEX and siloxanes on two complementary modules. The evaluation of these two columns allowed to validate the performances on a Rxi-1ms column and on Stabilwax. Siloxanes will be advantageously analyzed on the Rxi-1ms column while the Stabilwax column allows the separation of all xylenes, not separated on Rxi-1ms.


Compound identification: Standard: Trimethylsilanol (TMS), Benzene, Hexamethyldisiloxane (L2), Toluene, Xylene

Instrument : Micro GC Fusion module Rxi-1ms

Method :
Injector: Variable Volume
Column: Rxi-1ms 10m
Column temperature :

  • Programming: 50°C for 40 seconds >> 220°C (1°C/s) for 40 seconds
  • Carrier gas Helium, 25 psi

The Micro GC Fusion, thanks to the temperature programming, allows the improvement of the performances for the analysis of volatile organic compounds, VOC.

This application note presents the analysis of a BTEX standard at 3 ppm and TMS and L2 standards for siloxanes. The detection limit for each of these compounds is 1 ppm. Thus, the micro GC Fusion allows the on-line monitoring of the efficiency of purification processes. This new generation of Micro GC, benefiting from a simplified user interface, allows a relevant integration in industrial environment.

Learn more about the benefits of Micro GC Fusion.

Keywords: chromatography, micro gc, sensitivity, VOC analysis, BTEX, siloxanes, biogas, temperature programming