Published:Journal of Chromatographic Science,
ISSN 0021-9665 Volume
46, Number 5, May/June 2008, pp. 413-418
Direct Screening of Water Samples for Benzene
Hydrocarbon Compounds by Headspace Liquid-Phase Microextraction–Gas
Chromatography
Massoud Kaykhaii and Mohammad Moradi
Department of Chemistry, Faculty of Sciences, Sistan & Balouchestan
University, Zahedan 98135-674, Iran
The applicability of headspace liquid-phase microextraction
and gas chromatography is evaluated for the expeditious and reliable
screening of tap and drinking water samples for selected volatile
organic compounds (viz., benzene, toluene, ethylbenzene, and
xylene isomers, BTEX). The method uses 3.5 µL of n-hexadecane
as extraction solvent, 10 min extraction time with stirring at
1250 rpm, at 20°C and 0.38 g/mL salt addition. The enrichment
factors of this method are from 135 to 213. Limits of detection
are in the range of 4.1–23.5 ng/L. The relative standard
deviations at 0.05, 50, 200, and 400 µg/L of spiking levels
are in the range of 0.61%–4.01%. Recoveries of six BTEX
from drinking water at these spiking levels are between 95.4%
and 104.4%.
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