长江三角洲地区土壤环境质量与修复研究Ⅴ.废旧电子产品拆解场周边农田土壤含氯有机污染物残留特征

摘要

Composition and contents of chlorinated organic compounds were investigated of soils around used electronic device disassembling sites in the Yangtze River Delta. Results show that the total of the 20 kinds of PCBs in the test soil was in the range of 84.19～377.4 μg kg~(-1), with an average va1ue of 204.8 μg kg~(-1), of which subchloride PCBs include Di-Cl, Tri-Cl and Tetra-Cl accounted for 73.7% ～96.2% of the ∑PCBs, indicating input of exogenous PCBs. The total of HCH was in the range of 10.61～33.11 μg kg~(-1), and the total of DDT in the range of 11.36～33.28 μg kg~(-1), being quite low in residue level. Most of the HCH and DDT in the soils have degraded, but the average contents of β-HCH, γ-HCH, ∑HCH and ∑DDT were all higher than the corresponding target values in the Dutch List. Moreover, correlation analysis shows that residual contents of DDT in the soils was negatively related to total organic carbon (TOC) content, but such relationship was not found between TOC and other detectable organochlorines.%对长江三角洲地区某废旧电容器拆解场地周边农田基本保护区表层水稻土中含氯有机化合物的组成及含量进行初步研究.结果表明,供试土壤中20种PCBs总含量在84.19～377.4 μg kg~(-1)之间,平均含量为204.8 μg kg-1,其中二氯、三氯、四氯代同系物总和占总PCBs的73.7% ～96.2%,存在着PCBs的外源输入.HCH的总含量为10.61～33.11 μg kg~(-1),DDT总含量为11.36～33.28 μg kg~(-1),残留水平较低,但β-HCH、γ-HCH、∑HCH和∑DDT的平均含量均高于荷兰土壤标准的目标值.此外,DDT与土壤有机碳呈显著负相关,而其他含氯有机化合物的含量并未呈现出与土壤有机碳的相关性.