Abstract: Transport behavior of various speciation and each chemical form of heavy metals in soil from the different field around Cu-Ni mining area in Jinchang were assessed. The results show that the mean transfer coefficient of acid-soluble/exchangeable, reducible, oxidisable and residual fraction is 0.13, 0.51, 0.30 and 0.54, respectively. Furthermore, transfer coefficient between total content and variable speciation including acid-soluble/exchangeable, reducible, oxidisable fraction of heavy metals are different. Transfer coefficient of total Cr is 0.65 in tailings area, but that of variable speciation is 0.26. In contrast with Cr，transfer coefficient of total Ni is 0.26, but that of variable speciation is 0.67. The similar characteristics on Pb and Zn in cultivated soil, namely, transfer coefficient of total Zn is high, but low for variable speciation, which is reversed for Pb. Transfer coefficient of total content and variable speciation in abandoned soil are low compared with above two fields soil, especially, variable speciation of Cu and Ni are not transported almost down soil profile. The transport behavior of heavy metals in soil is closely related to the distribution of chemical forms of heavy metals. The transfer coefficient of variable speciation can effectively reflect transport feature of heavy metals in soil and its potential harmfulness.

Key words: heavy metal, chemical form, transfer behavior, soils, Jinchang City