引用本文:何媛媛,殷思敏.农用地土壤中六六六和滴滴涕8种有机氯农药测定的脱水前处理研究[J].环境监控与预警,2024,(3):43-48
HE Yuanyuan, YIN Simin.Research on Dehydration of Agricultural Soil Extract During BHCs and DDTs Deter[J].Environmental Monitoring and Forewarning,2024,(3):43-48
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农用地土壤中六六六和滴滴涕8种有机氯农药测定的脱水前处理研究
何媛媛,殷思敏
江苏省镇江环境监测中心,江苏 镇江 212009
摘要:
新鲜农用地土壤经快速溶剂萃取后,萃取溶液中含有水分。建立了采用快速溶剂萃取-气相色谱法测定农用地土壤中六六六和滴滴涕农药残留的方法,在加速溶剂萃取液中加入纯水,用减压蒸馏法将丙酮和正己烷去除,用正己烷液液萃取剩下的溶液,浓缩净化后进气相色谱仪检测。方法检出限为4.90×10-3~ 4.80×10-2 mg/kg,曲线的相关系数均>0.999,方法加标回收率为76.2%~91.2%,相对标准偏差为1.2%~6.1%。该方法准确可靠,可用于实际农用地土壤中六六六和滴滴涕的测定。
关键词:  农用地土壤  有机氯  快速溶剂萃取  水分  气相色谱法
DOI:DOI:10.3969/j.issn.1674-6732.2024.03.007
分类号:X833
基金项目:江苏省环境监测科研基金项目(2104);镇江市政策引导类计划软科学研究项目(RK2022033)
Research on Dehydration of Agricultural Soil Extract During BHCs and DDTs Deter
HE Yuanyuan, YIN Simin
Jiangsu Zhenjiang Environmental Monitoring Center,Zhenjiang,Jiangsu 212009,China
Abstract:
After rapid solvent extraction of fresh agricultural soil, the extraction solution contains water. A rapid solvent extraction gas chromatography method was established for the determination of BHCs and DDTs residues in agricultural soil. Pure water was added to the accelerated solvent extraction solution, acetone and n-hexane were removed by vacuum distillation, and the remaining solution was extracted by n-hexane using liquid liquid extraction, after concentrated and purified, the extract was then detected by gas chromatography. The detection limits were 4.90×10 -3~ 4.80×10-2 mg/kg, and the correlation coefficients were greater than 0.999. The recoveries were 76.2%~91.2%, and the relative standard deviations were 1.2%~6.1%. The method is accurate and reliable, and can be used for the determination of BHCs and DDTs in soil of actual agricultural land.
Key words:  Agricultural land  Organochlorine pesticides  Accelerated solvent extraction  Water content  Gas chromatography