摘要：

Ludwigia stolonifera biomass of roots, floating roots and leaves were tested for their performance as heavy metal biofilters. Cadmium (Cd) andnickel (Ni) (50 ppm) solutions were filtered through 0.5–5 g packed columns with each biomaterial, to determine their metalremoval efficiency. Root column was more efficient in removing Ni (as low as 6 ppb in the effluent) than of Cd (as low asto 22 ppb in the effluent). This tendency was also observed upon treatment of a mixed solution of both metals. Floating rootscolumn reduced Cd content to the same level as the root column, but its metal binding capacity was higher; 93 mg Cd g^-1 DW in floating roots in comparison to 43 mg Cd g^-1DW in the roots biofilter. Leaf biomass column demonstrated the best metal binding capacity; 128 mg Cd g^-1 DW, and Cd concentration in the effluent was 17 ppb. Pectin content was 5, 8 and 10% W/W in roots, leaves and floating roots

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