固相萃取- GC/MS法测定水中有机氯农药

建立了固相萃取-气相色谱／质谱联用测定水中痕量六六六、滴滴涕和环氧七氯的方法。采用C18固相萃取柱富集水样，二氯甲烷／丙酮混合溶剂洗脱，加入菲-d10作为内标，利用气相色谱／质谱联用仪选择离子监测模式检测，内标法定量，定性、定量准确，线性响应良好，干扰小，按采样1 L计算，方法检出限为4．26ng／L～19、2ng／L，RSD在0、4％-6、3％之间，平均加标回收率在77．7％～118％之间，实际样品测定结果表明方法能满足环境水体中痕量有机氯农药的监测要求。

Determ ination ofOrganochlorine Pesticidesin Water Sample by GasChromatography-MassSpectrometry with Solid -Phase Extraction

A method was established for trace BHC, DDT and heptachlor eqoxide in water sample by gas chromatography-mass spectrometry with solid-phase extraction. The organochlorine pesticides were extracted from water with octadecylsilica（C18） SPE cartridge, eluted with the mixture solvent of methylene chloride and acetone, detected by selected ion monitoring mode and phenanthrene-d10 as internal standard. The quantity and quality method of internal standard were correct. The good linear responses were achieved and little inference. The detection limits were 4.26 ng/L - 19.2 ng/L when the sample volume was 1 L and averge recoveries 77.7% -118% , RSD 0.4% -6.3%. The experiment results showed that the method is suitable for determination of trace organochlorine pesticides in environmental waters.