气相色谱法测定水中六种有机磷农药和阿特拉津

Determination of Six Kinds of Organophosphorus Pesticides and Atrazine in Drinking Water by Gas Chromatography

介绍了用全自动固相萃取方法富集饮用水中有机磷农药和阿特拉津,并用毛细管气相色谱法进行定量测定的方法。水中敌敌畏、乐果、毒死蜱、对硫磷、甲基对硫磷、马拉硫磷等6种有机磷农药和阿特拉津经固相萃取小柱富集后,以甲基叔丁基醚/甲醇混合溶剂(V∶V=90∶10)洗脱定容后,用Varian CP Sil 8 Low bleed毛细管色谱柱分离,氮磷检测器(NPD)检测。该方法中7种有机磷标准曲线线性相关系数均大于99%;加标回收率在85%～105%范围内,相对标准偏差4.0%～10.0%;最低检测浓度在0.05～0.23μg/L,满足国家标准GB 5749-2006的检测要求。

Determination of six kinds of organic phosphorus pesticides and atrazine in drinking water by automatic solid phase ex- traction and capillary column gas chromatography with NPD was introduced. Dichlorvos, atrazine, dimethoate（rogor）, methyl parathion, chlorpyrifos, parathion and malathion in the drinking water were adsorbed by solid phase extraction column first, eluent with MTBE/ Methanol aqueous （V/V=90/10） was washed out and set the volume, separated the analyte by the capillary column Varian CP Sil 8 Low bleed, and detected by NPD. Based on the method, the linear coefficients （R） of all the calibration curves were more than 99 %; The standard additions were between 85 %-105 %, relative standard deviation were between 4.0 %-10.0 %; and the minimun detect levels were between 0.05-0.23 Izg/L,which could reach the requirements of GB 5749-2006.