The Establishment and Comparison of HS-GC and HS-GC-MS Methods for The Determination of Benzenes in Drinking Water
Objective:To establish headspace gas chromatography and headspace GC/MS methods for the determination of seven benzene homologues(benzene,toluene,ethylbenzene,m-xylene,p-xylene,o-xylene and styrene)in drinking water,and to discuss the consistency of the two methods.Method:The conditions of headspace,chromatography and mass spectrometry were optimized,and the detection limits,precision and accuracy of the two methods were compared.Result:The recoveries of the two methods were 90.4%～100.2%,the relative standard deviations were 1.1%～4.3%,and the lowest detectable concentrations of headspace gas chromatography were 0.03～0.08 μg·L-1,the lowest detectable concentration of headspace GC-MS was 0.002～0.005 μg·L-1,there is no significant difference in the determination results.Conclusion:The two methods are simple,rapid,accurate and sensitive,and are suitable for the daily detection of benzene homologues in drinking water.Headspace GC/MS method is more sensitive and suitable for the determination of trace and matrix complex samples;Headspace gas chromatography is suitable for the determination of high concentration samples.
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