Research on remediation of heavy metals in sediment with lotus and water lily

The aquatic landscape plants lotus and water lily were selected to repair the heavy metal in black odorous river sediments. With ICP-AES inductively coupled full spectrum of direct reading plasma emission spectrometry, the total and forms of content of heavy metals Cd, Cr, Cu, Ni, Pb in sediment and plants, the distribution of heavy metals in plants to were determined. The results showed that the average removal rate of the lotus in terms of the removal of heavy metals in the sediments was 20.42% while that of water lily was 18.23%; after lotus and water lilies were planted, the forms of content of heavy metals in sediments were decreased, the phytoremediation of main forms of Cr, Pb, Ni in sediments were theresidual state; the main forms of Cd, Cu were extractable. The distribution of Cu, Ni among the water lilies was stem<leaf<root, Cd and Pb was leaf<stem<root, Cr was stem<root<leaf. The distribution of Cr, Ni in the lotus for root<leaf<stem, Cu was leaf<root<stem, Cd, Pb were mainly in the lotus leaf tissue.