The contents of As, Cd, Hg and Pb in root tubers of annual and biennial plants of Polygonum multiflorum Thunb. in Jiangsu Province were 0. 32, 0. 24, 0. 1.25 and 0. 20, 0. 26, 1.67×10-4 , 1.32 mg·kg-1 respectively, which totally met the standards of GTSIEMPP (WM2—2001). Biology concentration factors (BCF) of Cd is 2.4 -2.6, which indicates that the root tuber of P. multiflorum has a strong accumulative action to Cd. While the accumulative action to As, Hg and Pb is not strong, BCF are 0. 025-0. 015, 0-6.40×10-4 and 0. 06 respectively.
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