土壤样品中有机磷农药的加速溶剂萃取-气相色谱测定

Determination of Organophosphate Pesticides in Soil Samples by Accelerated Solvent Extraction-Gas Chromatography

摘要: 建立加速溶剂萃取提取土壤样品中13种有机磷农药残留,经Carb柱净化、Rtx-OPP2大口径毛细管柱分离、气相色谱-火焰光度检测器检测。方法仪器检出限在0.67~1.50 ng/mL,线性范围在0.67~600 ng/mL,相关系数在0.9994~0.9999。模拟土壤样品和实际土壤样品基体加标回收率分别在54.3%~106%和60.7%~133%,方法精密度(RSD,n=5)在2.2%~9.9%。方法简便、灵敏,适用于土壤样品中有机磷农药残留的分析。

Abstract: A method for the determination of organophosphate pesticides (OPPs) in soil samples by accelerated solvent extraction-gas chromatography (ASE-GC) was developed. Through the extraction by ASE, clean-up with Carb column, 13 OPPs in soil samples were separated and determined by Rtx-OPP2 wide bore capillary-gas chromatography with electron capture detector. The detection limits of the method for OPPs were 0.67~ 1.50 ng/mL with linear ranges of 0.67~600 ng/mL and correlation coefficients of 0.9994~0.9999. The average recoveries for 13 OPPs in simulated soil samples and real soil samples were 54.3%~106% and 60.7%~133% with precision of 2.2%~9.9% RSD(n=5). The method provides the advantages of high sensitivity, high reliability, convenience and is suitable for analysis of OPPs in soil samples.