正己烷萃取毛细管气相色谱法测定水中苯系物

Detection of benzene series in drinking water by GC and n-Hexane extraction

目的：建立用毛细管气相色谱对饮用水中苯系物进行测定的方法。方法：用气相色谱法，以正己烷为萃取溶剂萃取苯系物，用PEG-20M毛细管柱分离，以保留时间定性，外标法定量。结果：对7种苯系物进行测定，其平均回收率为91．4％～114％，相对标准偏差（RSD）为3．3％～11．4％，最低检测限为40μg／L。结论：结果表明，该方法操作简便、重现性好、灵敏度高，适用于饮用水中苯系物的测定。

Objective：To establish a method for determination of benzene series by gas chromatography with FID. Methods： The samples were extracted with n - Hexane and extracts were determined by GC with PEG - 20M capillary column using external standard calibration. Results：The benzene series were analyzed by GC with FID. The recovery and the relative standard deviation of the method were 91.4% - 114% and 3.3% - 11.4% ,respectively and limit of detection was 40 μg/L Conclusion：The methed is simple ,sensitive and suitable for determination of benzene series in water.