加速溶剂萃取-气相色谱法测定土壤中氟虫腈农药及其代谢产物残留

Determination of Fipronil in Soils by Accelerated Solvent Extraction and Gas Chromatography

研究了采用加速溶剂萃取及气相色谱法测定土壤中氟虫腈农药及其代谢产物残留最佳条件。结果表明,采用二氯甲烷和丙酮(1∶1,V/V)的混合溶剂,萃取温度80℃,压力为1500Pa,静态提取2次,土壤中MB46513、MB45950、氟虫腈、MB46136的加标回收率高,且重现性好。与微波助萃取和振荡提取法相比,加速溶剂萃取法耗时短,有机溶剂用量少,且提取回收率高。

A procedure for fipronil and its metabolites determination in soils was studied by accelerated solvent extraction（ASE） method. Optimal condition of ASE analysis was 80 ℃ with a mixture of dichloromethane and acetone（ 1：1, V/V） for two cycles under 1 500 Pa. The recoveries of fipronil and its metabolites （MB46513, MB45950 and MB46136） in soils were good and the precision （RSD） were generally better than 10%. Comparing with other extraction techniques such as microware assisted extraction （MAE） and shake bottle （SB） methods, the current method is faster and with less solvent consumption.