Phytoremediation of mercury and cadmium polluted wetland by Arundo donax

Abstract

Abstract: With a pot culture of simulated mercury (Hg) and cadmium (Cd)-polluted wetland,this paper studied the capability of Arundo donax in accumulating these heavy metals,and their distribution in the plant.The results showed that after grown in a 101 mg·kg^-1 Hg-polluted wetland for 8 months,the Hg-concentrating capability of Arundo donax was in order of root>stem>leaf,and the Hg concentration in its aboveground parts was 200±20 mg·kg^-1(DW); while in the case of 115 mg·kg^-1 Cd-pollution,the Cd-concentrating capability was in order of leaf>root>stem,and the Cd concentration in leaf was 160±26 mg·kg^-1(DW).The heavy metals concentration in Arundo donax organs increased with its growth time,being 30%～50% higher for 8 months than for 4 months.The BCF (Bio-concentration factor) decreased with increasing heavy metals concentration.In polluted wetland,the BCFs of Hg by the leaf and stem were 1.9 and 2.1,and those of Cd were 1.5 and 0.3,respectively; while in unpolluted wetland,the concentration of Hg and Cd was 6.8 and 8.5mg·kg^-1,the BCFs of Hg by the leaf and stem were 6.8 and 12.2,and those of Cd were 7.0 and 2.7,respectively.It was indicated that Arundo donax not only had the characters of large biomass,exuberant root,and good adaptability,but also exhibited high tolerance and concentrating capability to Cd and Hg.

Key words: Arundo donax, Phytoremediation, Wetland, Bio-concentration

CLC Number:

X171.5

HAN Zhiping, HU Xiaobin, HU Zhenghai . Phytoremediation of mercury and cadmium polluted wetland by Arundo donax[J]. Chinese Journal of Applied Ecology, 2005, 16(5): 945-950.

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