Protocol for the Analysis of High Concentrations of Benzene, Toluene, Ethylbenzene, and Xylene Isomers in Water Using Automated Solid-Phase Microextraction−GC−FID
Analysis of benzene, toluene, ethylbenzene, and xylene isomers (BTEX) in water using automated solid-phase microextraction (SPME) has been shown to be fast and efficient. However, environmental samples containing free-phase or high concentrations of BTEX must be diluted before analysis can proceed....
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| Veröffentlicht in: | Environmental science & technology 1996, Vol.30 (5), p.1521-1526 |
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| container_title | Environmental science & technology |
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| creator | Thomas, Steven P Sri Ranjan, Ramanathan Webster, G. R. Barrie Sarna, Leonard P |
| description | Analysis of benzene, toluene, ethylbenzene, and xylene isomers (BTEX) in water using automated solid-phase microextraction (SPME) has been shown to be fast and efficient. However, environmental samples containing free-phase or high concentrations of BTEX must be diluted before analysis can proceed. A protocol based on two dilutions, the first dilution using acetone and the second with distilled water, is described. Separatory funnel experiments indicated the aqueous solubilities of BTEX compounds in a complex mixture can be estimated using Raoult's law. The linear relationship of concentration as a function of response with SPME was more accurate for equal weight BTEX mixtures with concentrations ≤10 mg/L than for concentrations up to 200 mg/L. It is recommended to dilute high-concentration BTEX samples below the aqueous solubility indicated by Raoult's law to ensure accurate quantification. Using this dilution protocol, remediation projects with samples containing free-phase or high concentrations of BTEX can routinely use the SPME−GC−FID analysis method. |
| doi_str_mv | 10.1021/es950436s |
| format | Article |
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It is recommended to dilute high-concentration BTEX samples below the aqueous solubility indicated by Raoult's law to ensure accurate quantification. 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R. Barrie</au><au>Sarna, Leonard P</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Protocol for the Analysis of High Concentrations of Benzene, Toluene, Ethylbenzene, and Xylene Isomers in Water Using Automated Solid-Phase Microextraction−GC−FID</atitle><jtitle>Environmental science & technology</jtitle><addtitle>Environ. Sci. Technol</addtitle><date>1996</date><risdate>1996</risdate><volume>30</volume><issue>5</issue><spage>1521</spage><epage>1526</epage><pages>1521-1526</pages><issn>0013-936X</issn><eissn>1520-5851</eissn><coden>ESTHAG</coden><abstract>Analysis of benzene, toluene, ethylbenzene, and xylene isomers (BTEX) in water using automated solid-phase microextraction (SPME) has been shown to be fast and efficient. However, environmental samples containing free-phase or high concentrations of BTEX must be diluted before analysis can proceed. A protocol based on two dilutions, the first dilution using acetone and the second with distilled water, is described. Separatory funnel experiments indicated the aqueous solubilities of BTEX compounds in a complex mixture can be estimated using Raoult's law. The linear relationship of concentration as a function of response with SPME was more accurate for equal weight BTEX mixtures with concentrations ≤10 mg/L than for concentrations up to 200 mg/L. It is recommended to dilute high-concentration BTEX samples below the aqueous solubility indicated by Raoult's law to ensure accurate quantification. Using this dilution protocol, remediation projects with samples containing free-phase or high concentrations of BTEX can routinely use the SPME−GC−FID analysis method.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><doi>10.1021/es950436s</doi><tpages>6</tpages></addata></record> |
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| ispartof | Environmental science & technology, 1996, Vol.30 (5), p.1521-1526 |
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| language | eng |
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| source | American Chemical Society Journals |
| subjects | Analysis methods Applied sciences Automation Chemicals Chemistry Environmental monitoring Exact sciences and technology Natural water pollution Pollution Water Water treatment and pollution |
| title | Protocol for the Analysis of High Concentrations of Benzene, Toluene, Ethylbenzene, and Xylene Isomers in Water Using Automated Solid-Phase Microextraction−GC−FID |
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