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| Determination on Compound Specific Carbon Isotopes of Trace Benzenes in Water by Purge and Trap/Gas Chromatography－ Combustion－Isotope Ratio Mass Spectrometry |
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| DOI： |
| KeyWord:purge and trap technique trace benzenes compound specific carbon isotope analysis water |
| Author | Institution |
| SU Jing，YIN Xi-jie，DING Da，QI Yan |
1. Information and Testing Support Center，Third Institute of Oceanography，Ministry of Natural Resources，Xiamen ，China; 2. Soil Pollution Prevention and Control Research Center，Nanjing Institute of Environmental Sciences，Ministry of Ecological Environment，Nanjing ，China |
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| Abstract: |
| A gas chromatography/combustion－isotope ratio mass spectrometry（GC/C－IRMS） with purge and trap technique（P&T） was developed for the determination of compound specific carbon isotopes of trace benzenes in water in this paper. Three experimental conditions（purge time，purge temperature and dry-blow time） of P&T were investigated，and the optimal P&T efficiency was determined．The detection limits for trace benzenes in water were calculated by testing aqueous solutions of benzene in different mass concentrations．The results showed that under the conditions of 13 min of purge trapping and 3 min of dry-blowing time at 35 ℃，the P&T efficiencies for each benzenes（benzene，toluene，ethylbenzene，m/p-xylene，o-xylene，styrene and isopropylbenzene） in water samples could reach 95.0%，90.2%，71.3%，59.1%，69.4%，50.8% and 70.1%，respectively，and the isotope standard deviations（STD） ranged from 0.06‰ to 0.29‰．There were good linear relationships for the peak areas of seven benzenes and their concentration in ranges of 0.50－20.00 μg/L，with their correlation coefficients（r2） of 0.998 6－0.999 5．The standard deviations for the monomeric carbon isotope values of the seven benzenes were in the range of 0.090‰－0.48‰ at each concentration，and the differences between injection concentration and methods could not lead to carbon isotope fractionation．The detection limits for benzene，toluene，m/p-xylene，o-xylene and styrene in water samples were 1.00 μg/L，while those for ethylbenzene and isopropylbenzene were 0.50 μg/L．The established method can greatly improve the detection limits for benzene monomer carbon isotopes in water with accurate and reliable results to meet the needs for analysis on the monomer carbon isotopes of trace benzene in water. |
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