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Sorbent‐packed needle microextraction trap for benzene, toluene, ethylbenzene, and xylenes determination in aqueous samples
Author(s) -
De Crom Jorn,
Claeys Sara,
Godayol Anna,
Alonso Monica,
Anticó Enriqueta,
Sanchez Juan M.
Publication year - 2010
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.201000213
Subject(s) - ethylbenzene , chromatography , sorbent , solid phase microextraction , btex , chemistry , toluene , flame ionization detector , detection limit , aqueous solution , benzene , gas chromatography , analytical chemistry (journal) , volatile organic compound , desorption , xylene , sample preparation , repeatability , gas chromatography–mass spectrometry , mass spectrometry , adsorption , organic chemistry
A needle trap (NT) device filled with Carbopack X as a sorbent material is evaluated for the static headspace analysis of benzene, toluene, ethylbenzene, and xylene (BTEX) compounds in aqueous samples. Injection parameters used with the NT device ( e.g. volume of carrier gas and time to open the split valve) are evaluated to determine the mechanism involved during the desorption and transferring of the target compounds into the GC column. Furthermore, different parameters affecting the adsorption capacity of the sorbent are studied ( e.g. sampling time and temperature, headspace/sample volume ratio, salting‐out, and stirring). The evaluation of the method with aqueous samples shows that repeatability and recoveries with the NT device are equivalent to those obtained using solid‐phase microextraction with a carboxen/PDMS (CAR/PDMS) coating. LODs obtained with flame ionization detection are in the range of 10–25 μg/L, and in the range of hundredths of μg/L with MS detection. The method developed is satisfactorily applied to the analysis of aqueous samples obtained from wastewater treatment plants.