Effects of iron-and manganese-oxidizing Enterobacter and Comamonas on absorption of cadmium and arsenic in Brassica rapa L.
Enterobacter sp.A11 and Comamonas sp.A23 with the ability to oxidize Fe and Mn com-pounds was used to study the feasible methods for co-removing the cadmium(Cd)and arsenic(As)in soil.The effects of the biological Fe and Mn oxides(BFMO)generated by the mixed strains of A11 and A23 on the absorption of cadmium and arsenic in B.rapa.The results of scanning electron microscopy(SEM)showed that iron and manganese oxides were located on the surface of cells and led bacteria to ag-gregate into clusters.The results of pot experiment showed that strains A11 and A23 immobilized Cd and As in soil,reduced the proportion of bioavailable Cd and As,increased the proportion of unavailable Cd and As,and exhibited the absorption and accumulation of Cd and As in the aboveground and root parts of Bras-sica rapa L.as well.It is indicated that the biological iron manganese oxide generated by the mixed strains of A11 and A23 has a good adsorption effect on cadmium and arsenic in B.rapa.
EnterobacterComamonasbiological iron manganese oxidecadmiumarsenic
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