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J Chromatogr A

Title:		Compound-specific carbon isotope analysis of volatile organic compounds in water using solid-phase microextraction
Author(s):		Palau J; Soler A; Teixidor P; Aravena R;
Address:		"Department Cristallografia, Mineralogia i Diposits Minerals, Facultat de Geologia, Universitat de Barcelona, Marti i Franques s/n, 08028 Barcelona, Spain. jordi.palau@ub.edu"
Journal Title:		J Chromatogr A
Year:		2007
Volume:		20070629
Issue:		1-Feb
Page Number:		260 - 268
DOI:		10.1016/j.chroma.2007.06.050
ISSN/ISBN:		0021-9673 (Print) 0021-9673 (Linking)
Abstract:		"The compound-specific isotope analysis technique in conjunction with solid-phase microextraction using a carboxen-polydimethylsiloxane fiber was tested and implemented for isotopes analyses of organic compounds aiming for environmental application in contaminated groundwater. delta(13)C values of several chlorinated methanes and ethenes, toluene and chlorobenzene were determined using a gas chromatograph coupled to an isotope ratio mass spectrometer through a combustion interface. Direct and headspace solid-phase microextraction (D-SPME, HS-SPME) methods were tested in order to determine the optimum conditions to obtain reproducible delta(13)C values at very low concentration (microg/L range) and, to elucidate the carbon isotopic effects associated with the competitive extraction. For D-SPME, higher accuracy and precision of delta(13)C results were obtained with no salted aqueous standards. Despite that the delta(13)C of those compounds analyzed with both methods showed similar precision (<0.5 per thousand) and accuracy, the highest sensitivity was reached with HS-SPME. Furthermore, the delta(13)C values of cis-1,2-dichloroethylene, chorinated methanes and aromatic compounds obtained using HS-SPME showed measurable deviations with respect to the isotopic composition of pure phase compounds, however, these deviations are constant according to the analytical uncertainties, indicating that they are not affected by competitive extraction, and they could be corrected using standard correction technique based on internal calibrated standards"
Keywords:		"Carbon Isotopes Organic Chemicals/*analysis/chemistry Reproducibility of Results Solid Phase Microextraction/*methods Volatilization Water/*chemistry Water Pollutants, Chemical/analysis/chemistry;"
Notes:		"MedlinePalau, J Soler, A Teixidor, P Aravena, R eng Research Support, Non-U.S. Gov't Netherlands 2007/07/17 J Chromatogr A. 2007 Sep 7; 1163(1-2):260-8. doi: 10.1016/j.chroma.2007.06.050. Epub 2007 Jun 29"