Abstract
The phytoremediation performance of Mentha Aquatic, Typha Orientails Presl, Tagetes Patula L. and Iris Tectorum Maxim was investigated by pot experiments to remediate the heavy metal contaminated sediment added with 1‰, 3‰, and 5‰ humic acid (HA), respectively, over 60 days. The results showed that the four hydrophytes could get a better accumulation for Cd, Cu, Pb, and Ni from sediments with 3‰ HA as amendment. While, Mentha Aquatic, Typha Orientails got the maximum accumulation amount of Cu, Pb with 5‰ HA as amendment. As for Typha Orientails Presl, Tagetes Patula L. and Iris Tectorum Maxim, 3‰ HA was the optimum addition for sediments to accumulate Cd, with over 10% increase compared to the control sediment. An appropriate amount of HA as amendment can decrease the percent of residual fraction and improve the phytoremediation for metal contaminated sediments.
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