应用顶空进样-气相色谱与质谱联用技术测定了地表水中氯苯类化合物,即一氯代苯、1,2-二氯苯、1,4-二氯苯和1,2,4-三氯苯.在40~350 amu质量范围内全扫描方式进行定性分析,采用选择离子检测模式和外标法进行定量分析.上述4种氯代苯的检出限(3S/N)依次为0.23,0.25,0.25,0.28 μg·L-1.用此方法测定了一种标准样品(332502)中的氯代苯含量,测定值与标准值相符,测定值的相对标准偏差(n=6)均小于4%.

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%.