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
Research on Dehydration of Agricultural Soil Extract During BHCs and DDTs Deter-mination
何媛媛 1殷思敏1
作者信息
- 1. 江苏省镇江环境监测中心,江苏 镇江 212009
- 折叠
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4.90×10-3～4.80×10-2mg/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.
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.
关键词
农用地土壤/有机氯/快速溶剂萃取/水分/气相色谱法Key words
Agricultural land/Organochlorine pesticides/Accelerated solvent extraction/Water content/Gas chromatography引用本文复制引用
基金项目
江苏省环境监测科研基金(2104)
镇江市政策引导类计划软科学研究计划(RK2022033)
出版年
2024
NETL
NSTL
万方数据