The Evaluation Of Heavy Metals Pollution And Potential Of Phytoremediation In Xinzhuangzi Reclaimed Soil

The paper discussed the impact of heavy metal pollution in Xinzhuangzi reclaimed soil. Soil samples and plant samples were collected from this researching area, and analysed for the content of Cr, Zn, Cu, Ni, Pb, As, Cd and Hg, also used the potential ecological risk index to evaluate the contaminative status of heavy metal in soil. For the sake of providing a theoretical basis and technical supporting, the paper chose reasonably out pioneer plants which were tested for the ability of accumulate and tranlocate heavy metal, and discussed the potential of phytoremediation. At the same time, the correlation analysis of heavy metal between soils and plants. The main conclusions of this paper are as follows:(1) According to the analysis of physical and chemical properties in Xinzhuangzi reclaimed soil, which need for improved, soil nutrients was in a medium-low level and soil salinization. In comparison with the backgroud values of huainan soil, the content of Cr, Zn, Cu, Ni, Pb, Cd and Hg is higher, belong to pollution level; the content of As is lower.at a safety level.(2) The potential ecological risk coefficients of heavy metal was respectively 574.46.622.52 and 558.34 in soil profile. The surface soil layer and bottom soil layer were belong to strong ecological risk, the medium soil layer at a very strong ecological risk. The potential ecological risk index of heavy metals in soil profile decrease order is:medium soil layer> surface soil layer> bottom soil layer.(3) The ability of heavy metals absorption in different plants were difference. The absorption of As, Cd, Hg is higher than Cr, Zn, Cu, Ni, Pb. At the same time the absorption capacity of heavy metals is different in the organs of one plant. But it also released that the content of heavy metal in the underground part is higher than that in the aboveground part. The accumulation factor of crops also higher than weed. Therefore, it should not plant edible crops in serious soil heavy metal pollution areas, to aviod the heavy metals entering the body through the food chain and harm to people health.(4) The accumulative abilities of heavy metal in crops decrease in the order:As> Hg> Cd> Ni> Cu> Pb> Zn> Cr. The accumulative abilities of heavy metal in weed decrease in the order:Cd> Hg> Cu> Ni> As> Pb> Zn> Cr. The total accumulation factors of heavy metal in different plants decrease in the order:wheet> horsebean> rape> wide artemisia> herba cephalanoploris> annual fleabane. The rate of heavy metal tranport in these plants decrease in the order:Zn> Hg> As> Pb> Cu> Cd> Ni >Cr.(5) Rape and horsebean have better effect to absorb As and Hg. the accumulation factor and translocation factor is close to 1. with the characteristics of hyperaccumulators. Wheet has better effect to absorb As. the accumulation factor is great than 1. also has high translocation factor. Herba cephalanoploris has better effect to absorb Cd, wide artemisia has better effect to absorb Hg.(6) According to the relations between heavy metals in different profiles, the entire quantity of Pb and Ni, Cd andZn, Ni had high relevance, the source maybe the same. The entire quantity of Cr and Ni in the surface soil had good relevance with content of Cr and Ni in the plants at the level of 5%. The entire quantity of Cd in the surface soil had good relevance with content of Cd in the shoot at the level of 5%. The entire quantity of Zn in the surface soil had good relevance with content of Zn in the underground part at the level of 1%. Other heavy metals relevance missed.