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该文采集了海河上游地区土壤样品,测定了24种有机氯农药(OCPs)的残留量,并对其残留特征、污染来源和污染程度进行了研究。结果表明,海河上游地区土壤中检出大部分有机氯农药,其中3种有机氯农药检出率达到100%,OCPs总残留量(∑OCPs)范围为2.75~139 ng/g,平均为40.1 ng/g。DDTs和HCHs是土壤中有机氯农药的主要污染物,相应的残留量分别为2.75~131 ng/g和ND~11.0ng/g,二者的残留特征表明了该地区土壤中HCHs主要来自于早期商业残留,部分地区存在新源输入的可能;而DDTs主要来源于历史上DDTs农药的使用,部分地区显示有新源输入。土壤中HCHs污染程度较低,而部分地区土壤中DDTs属于较高程度污染,存在较大的环境风险。文章同时首次分析了海河上游土壤中DDTs的降解产物DDM(bis(p-chloropheny)-methane)、DDMU(bis(chlorophenyl)-1-chloroethylene)和DBP(dichloroben-zophenone)的残留量,并讨论了DDT降解产物的分布特征。
In this paper, the soil samples of the upper reaches of the Haihe River were collected and the residues of 24 organochlorine pesticides (OCPs) were determined. The residual characteristics, sources of pollution and pollution degree were also studied. The results showed that most of the organochlorine pesticides were detected in the soils of the upper reaches of the Haihe River. The detection rates of three organochlorine pesticides were 100% and the total OCPs (ΣOCPs) ranged from 2.75 to 139 ng / g with an average of 40.1 ng / g. DDTs and HCHs are the major pollutants of organochlorine pesticides in soils, with the corresponding residues of 2.75-131 ng / g and ND ~ 11.0 ng / g, respectively. The residual characteristics of DDTs and HCHs indicate that the soil HCHs in this area mainly come from early stage Commercial residues, and the possibility of new source input in some areas. However, DDTs mainly come from the historical use of DDTs pesticides, and some areas showed new source inputs. Soil HCHs pollution is low, while in some parts of the soil DDTs belong to a higher degree of pollution, there is a greater environmental risk. In the meantime, the residues of DDM (bis (p-chloropheny) -methane), bis (chlorophenyl) -1-chloroethylene and DBP (dichlorobenzophenone) Distribution Characteristics of DDT Degradation Products.