江西省不同利用方式土壤DDT残留特征及生态风险评价

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

[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。

[ 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 ug/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.