Development of a method for determination of VOCs (including methylsiloxanes) in biogas by TD-GC/MS analysis using Supel™ Inert Film bags and multisorbent bed tubes

Abstract

17An analytical method based on TD-GC/MS was developed and validated for the

Volatile methyl siloxanes (VMS) concentrations in outdoor air of several Catalan urban areas

“…TMS is a highly volatile and unstable compound (Arnold and Kajolinna, 2010), and the use of organic solvents, activated charcoal, Tenax TA, XAD resins and polyurethane foam (PUF) for its determination have not proved to be efficient (Grümping et al, 1998;Hayeck et al, 2015). However, its evaluation using methods based on adsorption in special cartridges followed by cryofocusing in cold traps and GC/MS (Grümping et al, 1998, Lee et al, 2012, Gallego et al, 2015 or PTR-ToF-MS (Hayeck et al, 2015) have proven to be effective. Outdoor air studies presented in Table 2 use sampling and analysis methodologies that are not suitable for the analysis of TMS, hence, these limitations can be an explanation of the little presence of this compound in outdoor air quality evaluations regarding VMS concentrations.…”

“…Collected air samples were analysed by thermal desorption and gas chromatographymass spectrometry (TD-GC/MSD) (Ribes et al, 2007). This methodology has been used in previous studies to identify and determine a wide range of VOC in ambient air (Gallego et al, 2009(Gallego et al, , 2011a and VMS in biogas (Gallego et al, 2015). The methodology allows a simultaneous quantification of VOC and VMS in only one sample, even though VMS concentrations in outdoor air are generally one to three orders of magnitude lower than VOC concentrations ( Fig S1).…”

“…Analytes were then injected onto the capillary column ( Quantification of samples was conducted by the external standard method with the m/z 1/m/z 2 ions presented in Table S1. The probable variability of VMS in air samples requires working with two different quantification ions for each studied chemical, m/z 1 (generally the major characteristic ion in the spectrum) for medium-low concentrated samples and m/z 2 (minor characteristic ion) for highly concentrated samples (Gallego et al, 2015). In the present case, however, only m/z 1 was used, as even though Puigdelfí VMS concentrations were quite high, up to one to two orders of magnitude higher that in the rest of samples, m/z 1 was appropriate.…”

Extract of Albizia kalkora leaves

“…We then raised the temperature to 280 ℃ at the rate of 5 ℃/min. Finally, hold at 280 ℃ for 2 minutes [17][18][19][20][21][22].…”

An experimental approach for the development of direct-absorption sampling method for determination of trimethylsilanol and volatile methylsiloxanes by the GC-MS technique in landfill gas

“…Siloxanes [4][5][6][7][8] represent hazardous contaminants of biogas [9][10][11][12] utilised for energy production; thus during combustion in engines, they are converted into microcrystalline glass form (SiO 2 ), which can damage the inner parts of engines, e.g. sparks, pistons or combustion chamber [13].…”