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| Analysis of Compound-Specific Hydrogen Isotope Compositions of Styrene in Aqueous Phases by Large Volume Injection-Gas Chromatography-Isotope Ratio Mass Spectrometry |
| Received:January 22, 2015 |
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| KeyWord:purge & trap;styrene;compound-specific hydrogen isotopic compositions |
| Author Name | Affiliation | E-mail | | ZUO Hai-ying | School of Water Resources and Environment, China University of Geosciences(Beijing), Beijing 100083, China
Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Zhengding 050803, China | | | ZHANG Lin | Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Zhengding 050803, China | | | LIU Fei | School of Water Resources and Environment, China University of Geosciences(Beijing), Beijing 100083, China | feiliu@cugb.edu.cn |
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| Abstract: |
| Compound-specific isotope analysis(CSIA) with on-line gas chromatography-isotope ratio mass spectrometry(GC/IRMS) offers a versatile tool for characterizing the origins and fates of organic contaminants in the environment. However, one major drawback of CSIA in field studies is that GC/IRMS system is currently low in sensitivity. In this study, a method based on purge & trap and gas chromatography combustion-isotope ratio mass spectrometry was developed to determine hydrogen isotope of styrene in water.Use of large sample volume(25 mL, which was not frequently used in organic analysis) lowered the detection limit. Under full purge-trap, all the targets were transferred into the trap and no isotope fractionation was observed. In the split injection mode, the targets were entered into gas chromatography at fixed ratio, and sharp peaks were obtained with decreased signals. The ratio of hydrogen isotope was significantly reduced due to fractionation of hydrogen isotope. In the splitless injection mode, the peaks of targets were wide with an acceptable tailing, but the signal was strong. No hydrogen isotope fractionation was observed, and the ratio of hydrogen isotope was comparable to that of direct injection. This method has a good parallelism at low, medium, and high concentrations(10.0 μg·L-1, 30.0 μg·L-1, 50.0 μg·L-1, 60.0 μg·L-1, 80.0 μg·L-1, 100.0 μg·L-1)with detection limit of 10.0 μg·L-1. Therefore, this method can be applied to analysis of hydrogen isotope in non-chloride pollution. |
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