黄河三角洲地区土壤中DDTs分布特征与风险分析

以滨州市滨城区为例，研究了黄河三角洲地区表层土壤（0～20cm）中DDTs残留现状、分布特征。土壤中6种DDT同系物（ρ，ρ′-DDT，σ，ρ′-DDT，ρ，ρ′-DDE，σ，ρ′-DDD，ρ，ρ′-DDD）的总含量为63．81～315．65gg／kg，平均浓度为190．52g／kg，沿城区农村这一梯度呈现明显的上升趋势。源解析表明该地区土壤中DDTs主要来源于滴滴涕和三氯杀螨醇的施用。依据我国土壤环境质量标准，研究区土壤DDTs属轻度污染，需加强对该地区土壤中I）DTs迁移转化情况进行监测，采取可行的措施，降低土壤中DDTs含量。

Distribution characteristics and risk analysis of DDTs in soils of the Yellow River Delta

Bincheng District is in the Binzhou City, located at the center of the Yellow River Delta YRD. To assess the current status of soil dichlorodiphenyl trichloroethane （DDT） residues and distribution characteristics, topsoil samples （0--20 era） were collected in this area. Concentrations of six soil DDT homologues （ρ,ρ′-DDT,σ,ρ′-DDT,ρ,ρ′-DDE,σ,ρ′-DDD,ρ,ρ′-DDD） ranged from 63.81 to 315.65 g/kg, with an average concentration of 190.52 g/kg, showing significant increase along the urban--rural gradient. Soil DDTs originated mainly from the past DDT usage and dicfol appliealion. According 1o the guidelines of the Chinese Environmental Quality Standard for Soils, soil DDTs residues were classified as low pollution. Monitoring and remediation is advised to assess and reduce negative environmental and human health effects from soil DDTs in the study area.