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Solid phase microextraction assisted by droplets‐based liquid–liquid microextraction for analysis of volatile aromatic hydrocarbons in water by gas chromatography
Author(s) -
Ciucanu Ionel,
Agotici Vlad
Publication year - 2012
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201101105
Subject(s) - solid phase microextraction , chromatography , chemistry , gas chromatography , gas chromatography–mass spectrometry , mass spectrometry
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 μ L m L −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 m L −1 for the target compounds using a 7‐μm bonded polydimethylsiloxane coating and a flame ionization detector. The validity of this method is demonstrated by the analysis of a real waste water sample.