« Previous AbstractCombination of biological processes for agro-industrial poultry waste management: Effects on vermicomposting and anaerobic digestion    Next AbstractA negative feedback signal that is triggered by peril curbs honey bee recruitment »

J Chromatogr A

Title:		Evidence for selectivity of absorption of volatile organic compounds by a polydimethylsiloxane solid-phase microextraction fibre
Author(s):		Niedziella S; Rudkin S; Cooke M;
Address:		"Toxic Gases Research Group, Centre for Chemical Sciences, Royal Holloway University of London, Egham, Surrey, UK"
Journal Title:		J Chromatogr A
Year:		2000
Volume:		885
Issue:		1-Feb
Page Number:		457 - 464
DOI:		10.1016/s0021-9673(00)00109-6
ISSN/ISBN:		0021-9673 (Print) 0021-9673 (Linking)
Abstract:		"Solid-phase microextraction using a 30 microns polydimethylsiloxane fibre has been used to sample the volatile organic compounds from standard mixtures and from mixtures produced by the decomposition of organic compounds. This method of sampling has been compared with the direct injection of an aliquot of headspace gas and shows an enrichment factor of approximately 100 over a 1 ml gas injection for organosulphur gases such as dimethyldisulphide. The performance of the fibre has been evaluated with respect to accuracy and precision at several concentrations in representing the composition of multicomponent mixtures. It was found that the presence of a second component in a gas sample reduced the capacity of the fibre to absorb the primary component. The selectivity of the fibre for various volatile compounds with differing functionality was also studied. It was found that the non-polar polydimethylsiloxane fibre preferentially absorbed the non-polar components of a mixture, e.g. nonane and, correspondingly, under reported the more polar components, e.g. ethanol. Hence, the fibre discriminates in favour of non-polar and against polar components in a mixture in comparison with direct analysis of a headspace sample. Thus, quantitation of a component in a multi-component mixture is liable to error from competitive interference from other components. A major advantage of the technique, however, is that it does not absorb, and therefore introduce, water into the analytical system"
Keywords:		"Absorption Dimethylpolysiloxanes/*chemistry Gas Chromatography-Mass Spectrometry/*instrumentation/methods Microscopy, Electron Organic Chemicals/*chemistry Sensitivity and Specificity Silicones/*chemistry Volatilization;"
Notes:		"MedlineNiedziella, S Rudkin, S Cooke, M eng Netherlands 2000/08/15 J Chromatogr A. 2000 Jul 14; 885(1-2):457-64. doi: 10.1016/s0021-9673(00)00109-6"