Suitability of Tedlar ® gas sampling bags for siloxane quantification in landfill gas

Landfill or digester gas can contain man-made volatile methylsiloxanes (VMS), usually in the range of a few milligrams per normal cubic metre (Nm 3). Until now, no standard method for siloxane quantification exists and there is controversy with respect to which sampling procedure is most suitable. T...

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Bibliographic Details
Published in:Talanta (Oxford) 2010-06, Vol.82 (1), p.92-98
Main Authors: Ajhar, M., Wens, B., Stollenwerk, K.H., Spalding, G., Yüce, S., Melin, T.
Format: Article
Language:English
Subjects:
Analytical chemistry
Analytics
Biogas
Chemistry
Chromatographic methods and physical methods associated with chromatography
Exact sciences and technology
Fitting
Gas chromatographic methods
Gases - chemistry
GC–MS
Limit of Detection
Polyethylene Glycols - chemistry
Polyethylene Terephthalates
Reproducibility of Results
Silicon
Siloxanes - analysis
Spectrometric and optical methods
Temperature
Time Factors
Volatilization
Waste Management
Water - chemistry
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Summary:Landfill or digester gas can contain man-made volatile methylsiloxanes (VMS), usually in the range of a few milligrams per normal cubic metre (Nm 3). Until now, no standard method for siloxane quantification exists and there is controversy with respect to which sampling procedure is most suitable. This paper presents an analytical and a sampling procedure for the quantification of common VMS in biogas via GC–MS and polyvinyl fluoride (Tedlar ®) bags. Two commercially available Tedlar bag models are studied. One is equipped with a polypropylene valve with integrated septum, the other with a dual port fitting made from stainless steel. Siloxane recovery in landfill gas samples is investigated as a function of storage time, temperature, surface-to-volume ratio and background gas. Recovery was found to depend on the type of fitting employed. The siloxanes sampled in the bag with the polypropylene valve show high and stable recovery, even after more than 30 days. Sufficiently low detection limits below 10 μg Nm −3 and good reproducibility can be achieved. The method is therefore well applicable to biogas, greatly facilitating sampling in comparison with other common techniques involving siloxane enrichment using sorption media.
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2010.04.001