辽宁植烟土壤重金属含量和农药残留量调查与评价

为了解辽宁植烟土壤重金属污染和农药残留状况,对辽宁省10个植烟县(市)土壤的As、Hg、Pb、Cd、Cr、Cu和Ni 7种重金属含量及六六六(HCH)和滴滴涕(DDT)2种农药残留量进行了测定与污染评价。结果表明,无论辽宁植烟区整体还是各个县(市),土壤重金属Cr、Ni、Cu、As含量均达到国家土壤环境质量一级标准,Hg含量均达到国家土壤环境质量二级标准;Cd、Pb含量整体分别达到国家土壤环境质量二级、一级标准,仅个别地区处于一级、二级标准。无论辽宁植烟区整体还是各个县(市),土壤HCH和DDT残留量均达到国家土壤环境质量一级标准。土壤中As、Hg、Pb、Cd、Cr、Cu、Ni及HCH、DDT的污染指数均小于1,重金属的内梅罗综合污染指数为0.60,农药的内梅罗综合污染指数为0.042,两者均小于0.7。可见,辽宁植烟土壤处于清洁水平,适合无公害农产品生产。

Investigation and Assessment of Heavy Metal Content and Pesticide Residue in Tobacco-growing Soil in Liaoning

In order to investigate the situation of heavy metal contamination and pesticide residue in tobacco-growing soils in Liaoning province, the contents of As, Hg, Pb, Cd, Cr, Cu, Ni, HCH and DDT were measured in soils from 10 counties ( cities ) in Liaoning, and evaluated. The results showed that whether the whole tobacco-growing area or the each county(city),the contents of Cr,Ni ,Cu,As all reached the first standard of national soil environmental quality, Hg content all reached the second standard of national soil environmental quality;the contents of Cd ,Pb reached the second,first standard of national soil environmental quality respectively, for the whole tobacco-growing area, only which in individual area reached the first, second standard of national soil environmental quality respectively. Whether the whole tobacco-growing area or the each county ( city ) , the residues of HCH and DDT all reached the first standard of national soil environmental quality. The single factor pollution indexes of As, Hg,Pb,Cd,Cr,Cu,Ni,HCH and DDT were all less than 1,the Nemerow comprehensive pollution indexes of heavy metals, pesticide were 0. 60, 0. 042, respectively. These results suggested that the tobacco-growing soils in Liaoning were clean, and the soils were suitable for the production of nuisanceless agricultural products.