气相色谱法测定土壤中菊酯类农药残留

以正己烷/丙酮混合溶剂(体积比为1∶1)为提取剂,采用Florisil柱净化、气相色谱电子捕获检测器测定土壤中菊酯类农药残留,优化了提取条件。4种菊酯类农药在0.010 mg/L~1.00 mg/L范围内线性良好,方法检出限为0.005 mg/L~0.010 mg/L,甲氰菊酯回收率为85.2%~103%,RSD为2.3%~5.4%;氯氰菊酯回收率为80.5%~103%,RSD为2.8%~6.7%;氰戊菊酯回收率为80.2%~103%,RSD为2.3%~6.0%;溴氰菊酯回收率为80.8%~103%,RSD为2.4%~6.2%。

Determ ination of Pyrethroid Pesticide Residuein Soilby GC

4 pyrethroid pesticides in soil were determined by GC/ECD with extraction of solution [ V（hex- ane） ： V（acetone） = 1 ： 1 ] and purification of Florisil columns. By optimizing extraction condition the results showed good linearity; results showed good linearity ranging from 0. 010 mg/L to 1.00 mg/L of 4 pyrethroid pes- ticides; detection limits of pyrethroid pesticides between 0. 005 mg/L and 0. 010 rag/L; spiked recoveries of fen- propathrin between 85.2% and 103% ; RSD of fenpropathrin between 2.3% and 5.4% ; spiked recoveries of cypermethrin between 80.5% and 103% ; RSD of cypermethrin between 2.8% and 6.7% ; spiked recoveries of fenvalerate between 80.2% and 103% ; RSD of fenvalerate between 2.3% and 6.0% ; spiked recoveries of del- tamethrin between 80.8% and 103% ; RSD of dehamethrin between 2.4% and 6.2%.