Determination of benzene, toluene, ethylbenzene, xylenes in water at sub-ngl−1 levels by solid-phase microextraction coupled to cryo-trap gas chromatography–mass spectrometry
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| Title: | Determination of benzene, toluene, ethylbenzene, xylenes in water at sub-ngl−1 levels by solid-phase microextraction coupled to cryo-trap gas chromatography–mass spectrometry |
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| Authors: | Lee, Maw-Rong1 mrlee@dragon.nchu.edu.tw, Chang, Chia-Min1, Dou, Jianpeng1,2 |
| Source: | Chemosphere. Nov2007, Vol. 69 Issue 9, p1381-1387. 7p. |
| Subjects: | Water analysis, Benzene, Toluene, Ethylbenzene, Extraction (Chemistry), Chromatographic analysis |
| Abstract: | 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 75μm carboxen/polydimethylsiloxane (CAR/PDMS)-coated fiber at a sodium chloride concentration of 267gl−1, extraction for 15min at 25°C and desorption at 290°C for 2min. Good linearity was verified in a range of 0.0001–50μgl−1 for each analyte (r 2 =0.996–0.999). The limits of detection (LODs) of BTEX in water reached at sub-ngl−1 levels. LODs of benzene, toluene, ethylbenzene, m/p-xylene and o-xylene were 0.04, 0.02, 0.05, 0.01 and 0.02ngl−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-ngl−1 level. [Copyright &y& Elsevier] |
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| Database: | Engineering Source |
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