Study On Heavy Metal Pollution Of Soils And Phytoremediation Around Chromium-containing Slag Heap

Heavy metal pollution has become an increasingly serious enviro-nmental problems.There are many reports about heavy metal pollution at home and abroad. The characteristics of heavy metal pollution is hidden, long-term, cumulative, irreversible. Repairing the soil of heavy metal pollution become an urgent problem. The traditional methods have many drawbacks.In this situation, the phytoremediation method have been widely used.Which also asked to find hyperaccumulators of heavy metals. In this study, investigate heavy metal pollution area and collect plant samples and soil samples for analysis.Find out several hyperaccumulator of heavy metal. The results are as follows:1.The soil of the sampling points have been polluted by heavy metals Cr, the average content of the soil is1168.97mg/kg.The minimum content is792.82mg/kg, the largest content is1537.9mg/kg.The content of specific sampling sites is more than10000mg/kg.The content of Cr is several times more than environmental quality standard for soils. The content of Pb is higher, close to the background value of the national standards. The content of Cu and Zn di d not exceed the state standards for the background value,the soil was not suff er Cu, Zn pollution.2.Analysis of the sample heavy metal content showed that,The hyperaccu-mulator of Cr is Setaira viridis(L.)Beauv. The content of up-ground is18672.6mg/kg,the BAC1.60,the BTC2.35. Radix Sanguisorbae,Juncus effusus,Chloris virgal a Swartz,Artemisia sacrorum Ledeb,Leonurus heterophyllus Sweet are enrichment plant of Cr.3.Cirsium segetum, Setaira viridis(L.)Beauv, Juncus effusus, Chloris virgat a Swartz, Cirsium japonicum DC, Ziziphus jujuba var.spinosa(Bunge)Hu, Poten tilla aiscolor Bunge, Erigeron annuus, Artemisia argyi are enrichment plant of Pb.4.Failed to find out enrichment plant of Zn and Cu.5.Correlation Analysis show that significant correlation between Zn and Cr, Pb and Zn,Pb and Cu.