苏中地区农用土壤和大米中有机氯污染及其关系

Research of Organochlorine Pollution in Agricultural Soil and Rice in Jiangsu Central Area

[目的]建立了测定土壤和大米有机氯(OCPs)中的六六六、DDT含量的方法。[方法]采用加速溶剂萃取/固相萃取小柱萃取-电子捕获检测器(ASE-SPE-GC/ECD),ASE萃取溶剂为正己烷-丙酮(1∶1)。[结果]采用加速溶剂萃取进行样品的预处理,提取时间缩短至20 min,提取溶剂体积降至50 ml,缩短了分析时间,降低了成本。8种农药在土壤和大米中均有残留,总体上低于国家规定的限量标准。[结论]对土壤和大米中的有机氯残留进行多元线性回归分析,首次提出二者之间的线性关系公式:y=0.169x1+0.121x2(常数强制为0)。这为粮食基地可持续利用及食品安全风险评价提供参考,具有较强的实用价值。

[ Objective ] The research aimed to establish the method about the organochlorine （OCPs） determination in soil and rice. [ Meth- od ] Accelerate solvent extraction -solid phase extraction -electron capture detector （ASE-SPE-GC/ECD） was usedl The solvent was n-hexane- acetone （ 1：1 ）. [ Result] The methods of sample pretreatment accelerated solvent extraction, extraction time was shortened to 20 min, and ex- traction solvent volume was decreased by 50 ml. So the analysis time was shortened, and the cost was reduced. The pesticide in soil and rice was residual, generally lower than the state standard. [ Conclusion ] Multiple linear regression analysis was made. The relationship between them y =0. 169x1 ＋0. 121x2 was put forward for the first time, which provided reference for food safety risk assessment.