江西省不同利用方式土壤DDT残留特征及生态风险评价

目的]探究江西省不同利用方式土壤DDT残留特征及生态风险。方法]利用GC-ECD检测江西省7种不同利用方式土壤中的DDTs残留。比较了不同利用方式土壤DDT残留水平,分析了DDT来源,评价了DDT生态风险。结果]7种不同利用方式土壤DDTs残留量整体处于较低水平,其平均残留量为0.37μg/g。7种不同利用方式土壤DDTs残留量：桔树生长地土壤〉水稻种植地土壤〉茶树生长地土壤〉河滩草地土壤〉蔬菜种植地土壤〉板栗树生长地土壤〉棉花种植地土壤。DDT组分中,仅p.p′-DDT被检出,这表明7种土壤均有新的DDT污染源输入。生态风险评价表明,7种不同利用方式土壤中的DDTs对该地区鸟类、土壤生物及哺乳动物的风险较低。结论]DDT对江西省农产品质量安全和人类健康存在潜在的威胁。

Residual Characteristic and Eco-risk Assessment of DDT in Differently Using Types Soil in Jiangxi Province

Objective] The study aimed to explore residual characteristic of DDT and ecological risk.Method] Using GC-ECD detected DDT of the seven kinds of differently using way types soil in Jiangxi Province.DDT residual level of differently using way types soil were compared,origins of DDT was analyzed,eco-risk of residual assessed.Result] As a whole,the level of concentration of DDT in seven kinds of differently using types soil was low,which average residual amount was 0.37 μg/kg.The concentration of DDT in 7 kinds of differently using types soil in turn was showed orange soils＞rice soils＞tea soils＞the beach grass soils＞vegetable soils＞chestnut soils＞cotton soils.Only p.p′-DDT was seized out in all of the DDT components,which indicated that DDT might be input into environment recently.The eco-risk analysis showed that DDT residues in seven kinds of differently using types soil would not pose much risk to the birds,geobiont and mammal.Conclusion] DDT still was dangerous to food quality and human health in Jiangxi Province.