Study on sorption and accumulation for different kinds of Brassica juncea with Cd,Pb and Zn in the soil

The soil pot experiment about compound contamination with cadmium,zinc and lead was carried out with meadow cinnamon soil and different species of Brassica juncea.The results showed that the average amount of sorption for the seven species of Brassica juncea on the ground part Cd is 2.73～51.23 mg/kg,Pb is 16.87～75.03 mg/kg,Zn is 153.53～7 346.59 mg/kg.The underground part Cd is 7.32～101.33 mg/kg,Pb is 28.85～613.36 mg/kg,Zn is 348.91～954.29 mg/kg.The content of ground part for Cd is ⅦⅥⅡⅢⅣⅠⅤ,Pb is ⅡⅢⅠⅣⅥⅤⅦ,Zn is ⅥⅣⅦⅢⅡⅠⅤ.The content of underground part for Cd is ⅦⅥⅠⅣⅡⅤⅢ,Pb is ⅡⅦⅣⅠⅥⅢⅤ,Zn is ⅤⅦⅡⅠⅥⅣⅢ.The highest content of Cd is species Ⅵ and the highest content of Pb,Zn is species Ⅱ.In short,the ability of translocation is ZnCdPb,the ability of bioaccumulation is CdZnPb.There is no compound effect between the 3 heavy metals for the sorption of Brassica juncea.