【作者】 蒋慧；

【导师】 王正萍；

【作者基本信息】 南京理工大学 ， 环境工程， 2004， 硕士

【摘要】 本课题研究的是一种快速测定土壤中农药残留的新方法及其应用。实验采用薄层层析、土壤柱层析结合固体直接进样法研究了滴滴涕在土壤中的迁移性和溴氰菊酯在土壤中的移动和降解。固体直接进样法无需使用溶剂提取，并且可以免去净化浓缩，直接用土壤样品进样分析。实验从固体直接进样法的重复性、准确度、解吸温度、解吸率、进样口升温方式等几个方面对该方法进行了研究，确定了实验的最佳条件，采用外标法进行定量分析：在对滴滴涕和溴氰菊酯在土壤中移动性的研究中，采用了薄层层析和土壤柱两种方法，结果得出滴滴涕在中性土壤当中属于一级难移动农药，在非中性的条件下，移动性有所增强；溴氰菊酯在中性土壤中移动性最弱，属于二级不易移动农药，非中性条件下，R_f随着pH的降低而有所降低；溴氰菊酯在土壤中降解符合一级降解模式，方程为C=195.9e^-0.0979t，降解的半衰期为7.1天。更多还原

【Abstract】 In this paper, a new analytical method for the pesticide residues in soil sample was studied. This method is based on a novel direct sample introduction instrument called ChromatProbe that enables extract-free soil sample introduce into GC. The experimental conditions for the experiment were optimized. The relative standard deviation is within 1.5%~5.5%.The sample recovery is within 80%~ 110%. The new technique was used to study the transferability of DDT, deltamethrin and the degradation of deltamethrin in the soil. Compared to the non-neutral soil environment, the transferability of DDT and deltamethrin in neutral soil is the weakest. According to the Rf,the transferability gradation of DDT is I grade, while the gradation of deltamethrin is II grade. The degradation equation of deltamethrin in the soil is C =195.9e--0.0979t.The half-life of deltamethrin is about 7. 1d.更多还原