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J Sep Sci

Title:		Solid phase microextraction assisted by droplets-based liquid-liquid microextraction for analysis of volatile aromatic hydrocarbons in water by gas chromatography
Author(s):		Ciucanu I; Agotici V;
Address:		"Department of Chemistry, West University of Timisoara, Timisoara, Romania. iciucanu@cbg.uvt.ro"
Journal Title:		J Sep Sci
Year:		2012
Volume:		35
Issue:		13
Page Number:		1651 - 1658
DOI:		10.1002/jssc.201101105
ISSN/ISBN:		1615-9314 (Electronic) 1615-9306 (Linking)
Abstract:		"A new technique for the analysis of volatile aromatic hydrocarbons by combining liquid-liquid microextraction with solid phase microextraction has been developed. The analytes were extracted from aqueous samples by an immobilized polydimethylsiloxane fiber assisted by the droplets of an appropriate organic solvent. Benzene, toluene, ethylbenzene, and o-xylene were used as target analytes. The main factors potentially affecting the microextraction such as the nature and the volume of organic solvent, polydimethylsiloxane (PDMS) swelling, extraction time, agitation, temperature, and salts were optimized. The method requires a very low consumption of organic solvent. The relative enrichment factor is in the range of 7.1-32.4 for extraction in the presence of dichloromethane at an optimum volume of 18 muL mL(-1) of aqueous sample. This enhancement over regular polydimethylsiloxane fiber is primarily the result of the fiber swelling and of a stable thin layer of organic solvent attached to the surface of the PDMS fiber. The limit of detection ranges from 0.02 to 0.65 ng mL(-1) for the target compounds using a 7-mum bonded polydimethylsiloxane coating and a flame ionization detector. The validity of this method is demonstrated by the analysis of a real waste water sample"
Keywords:		"Chromatography, Gas Hydrocarbons, Aromatic/*analysis/*isolation & purification Liquid Phase Microextraction/*methods Solid Phase Microextraction/*methods Volatilization Water Pollutants, Chemical/*analysis/*isolation & purification;"
Notes:		"MedlineCiucanu, Ionel Agotici, Vlad eng Evaluation Study Germany 2012/07/05 J Sep Sci. 2012 Jul; 35(13):1651-8. doi: 10.1002/jssc.201101105"