固相萃取-气相色谱/质谱法测定地下水中15种农药残留

通过优选色谱柱,进一步改进色谱分离条件,优化前处理方法,建立一种快速高效测定地下水中15种农药残留量的GC-MS方法。该法采用分段法选择离子(SIM)扫描,具有更高的灵敏度、较低的检出限和较高的回收率,检出限低于0.004 8μg/L,回收率为85.9%~107.4%。本方法的突出特点是前处理速度快、萃取溶剂用量少、环境污染小、色谱运行时间短,基本稳定在25 min内完成分析,适用于大批量样品检测。

SPE-GC/MS Method for the Determination of 15 Pesticide Residues in Ground Water

The GC-MS method for the determination of 15 pesticide residues in ground water was established by utilizing the appro-priate chromatographic column, further improving the chromatographic separation condition and optimizing the pretreatment method. The outstanding characteristic of this method is the fast processing speed, less solvent consumption, less environmental pollution and short running time within 25 min, which is suitable for the detection of large quantities of samples. In addition, select ion monitoring ( SIM) mode combined with segmentation obtained higher sensitivity. This method has better recover and lower detection limit, the detection limit is less than 0. 004 8 μg/L, and the recovery rate ranged from 85. 9% ~107. 4%.