Head Space-GC-MS Determination of Chlorobenzenes in Surface Water

Gas chromatography with head-space sample introduction and hyphenated with mass spectrometry (HS-GC-MS) was applied to the determination of chlorobenzenes (i.e.monochlorobenzene,1,2-dichlorobenzene,1,4-dichlorobenzene and 1,2,4-trichlorobenzene) in surface water.Qualitative analysis was carried out by the whole scanning mode in the mass range of 40 to 350 amu.Quantitative analysis was performed by using the SIM mode and the external standard method.Values of detection limit (3S/N) of the method for the above mentioned 4 chlorobenzenes were found to be 0.23,0.25,0.25,0.28 μg·L-1 respectively.A standard sample (332502) was analyzed for its contents of chlorobenzenes by the present method,and the results obtained were in consistency with the standard values.Values of RSD′s (n=6) of the analytical results were all less than 4%.