Determination of benzene, toluene, ethylbenzene, xylenes in water at sub-ng l-1 levels by solid-phase microextraction coupled to cryo-trap gas chromatography-mass spectrometry

Journal Article

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Chemosphere

Nov

1381

1387

LR: 20131121; JID: 0320657; 0 (Benzene Derivatives); 0 (Water Pollutants, Chemical); 0 (Xylenes); 3FPU23BG52 (Toluene); J64922108F (Benzene); L5I45M5G0O (ethylbenzene); 2006/12/26 [received]; 2007/05/01 [revised]; 2007/05/03 [accepted]; 2007/06/19 [aheado

England

0045-6535; 0045-6535

PMID: 17582460

eng

Journal Article; Research Support, Non-U.S. Gov't; IM

S0045-6535(07)00615-7 [pii]

Unknown(0)

17582460

A trace analytical method of benzene, toluene, ethylbenzene and xylenes (BTEX) in water has been developed by using headspace solid-phase microextraction (HS-SPME) coupled to cryo-trap gas chromatography-mass spectrometry (GC-MS). The chromatographic peak shape for BTEX was improved by using cryo-trap equipment. The HS-SPME experimental procedures to extract BTEX from water were optimized with a 75 microm carboxen/polydimethylsiloxane (CAR/PDMS)-coated fiber at a sodium chloride concentration of 267 g l(-1), extraction for 15 min at 25 degrees C and desorption at 290 degrees C for 2 min. Good linearity was verified in a range of 0.0001-50 microg l(-1) for each analyte (r(2)=0.996-0.999). The limits of detection (LODs) of BTEX in water reached at sub-ng l(-1) levels. LODs of benzene, toluene, ethylbenzene, m/p-xylene and o-xylene were 0.04, 0.02, 0.05, 0.01 and 0.02 ng l(-1), respectively. The proposed analytical method was successfully used for the quantification of trace BTEX in ground water. The results indicate that HS-SPME coupled to cryo-trap GC-MS is an effective tool for analysis of BTEX in water samples at the sub-ng l(-1) level.

Benzene/analysis, Benzene Derivatives/analysis, Environmental Monitoring/methods, Freezing, Gas Chromatography-Mass Spectrometry/methods, Reproducibility of Results, Sensitivity and Specificity, Solid Phase Microextraction, Toluene/analysis, Water Pollutants, Chemical/analysis, Xylenes/analysis

Lee,M. R., Chang,C. M., Dou,J.

Department of Chemistry, National Chung Hsing University, Taichung 40227, Taiwan, ROC. mrlee@drgon.nchu.edu.tw

20070619

http://vp9py7xf3h.search.serialssolutions.com/?charset=utf-8&pmid=17582460

2007