The distribution characteristics and the speciation of heavy metals pollutants in soil along roadway in JiaoKe，Jiaozuo city, China

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The heavy metals pollution in farm soil around the transportation skeleton line in Jiaoke was investigated.14 soil samples were collected and treated with HNO3-HF-HCLO4,then the contents of Cd、Cr、Cu、Ni、Pb 、Zn and As were determined by ICP-MS and assessed systematically, forms of the heavy metals were analyzed by Tessier method. The results indicted that the soil belonged topolymetalic compound pollution in which As、Cd and Pb were the most serious pollutants. The pollution was the heaviest in farm soil that 15m apart from the transportation line, with Nemerow index 6.1465. We found that the Nemerow index reduced with the increase of the distance. Forms of the heavy metals showed: the valid state percentage of heavy metal in soil followed the order of Pb＞Ni＞Cr＞Cu＞Cd＞Zn＞As. The forms of Ni,Cd,Zn and Pb in farm soil showed: residual fraction＞Fe-Mn oxidizable fraction＞organic fraction＞exchangeable fraction＞acid extractable fraction, The forms of Cu and As in farm soil showed: residual fraction＞organic fraction＞Fe-Mn oxidizable fraction＞exchangeable fraction＞acid extractable fraction ; The forms of Cr in farm soil showed: residual fraction ＞ Fe-Mn oxidizable fraction ＞ organic fraction ＞ acid extractable fraction ＞ exchangeable fraction. The higher valid state and lower residual fraction percentage of Pb in soilimplied that it should be paid attention to potential effects of heavy metals on regional ecosystem.