油污染土壤重金属赋存形态和生物有效性研究

Study on the speices and the bioavailabilities of heavy metals in oil-polluted soil

采用逐级提取法对江苏某油区５个已污染的碱性土壤中的Ｐｂ、Ｃｄ、Ａｓ、Ｃｒ的金属赋存形态和在其上生长的植物的生物可给性进行了调查结果表明，除总Ｃｄ外，其他３种金属对土壤都有不同程度的污染污染类型不同，使莎草的生物有效性有较大差异，与对照点相比，除总Ｃｒ外，其它３种金属的生物富集系数明显降低金属赋存形态也有不同，其中Ｐｂ和Ｃｒ以铁锰结合态和残渣态为主，Ａｓ以铁锰结合态、残渣态和有机质结合态为主，Ｃｄ以碳酸盐结合态和残渣态为主.

In this paper,the depositing forms of the species of metals (lead,cadundum,arsenic and chromium) and the bioavailabilities of the growing plants in 5 oil-polluted areas of alkailine soil in Jiangsu Province were surveyed bysequential extraction Procedures.T'he results indicated that 3 species of the metals have different degrees of pollution on the soil except Cd; there are different bioavailabilities of cyperas with distinct pollution type,in comparison being greatly reduced; the bio-concentration coefficients of 3 species of the metals and the depositing forms of the metal species are aslo different, that of Ph and Cr being in forms of iron-managanese oxide and residue, that of as being of iron-managanese,residue and strongly bound-organic,while that of Cd being of carbonate and residue.