Luo Chun-Ling, Shen Zhen-Guo, Li Xiang-Dong
Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
Int J Phytoremediation. 2007 May-Jun;9(3):181-96. doi: 10.1080/15226510701375986.
Using pot experiments, the effect of the application of the biodegradable chelating agent S,S-ethylenediaminedisuccinic acid (EDDS) in hot solutions at 90 degrees C on the uptake of Cu, Pb, Zn, and Cd by corn (Zea mays L. cv. Nongda No. 108) and beans (P vulgaris L. white bean), and the potential leaching of metals from soil, were studied. When EDDS was applied as a hot solution at the rate of 1 mmol kg(-1), the concentrations and total phytoextraction of metals in plant shoots exceeded or approximated those in the shoots of plants treated with normal EDDS at the rate of 5 mmol kg(-1). On the other hand, the leaching of Cu, Pb, Zn, and Cd after the application of the hot EDDS solution at the rate of 1 mmol kg(-1) was reduced by 46%, 21%, 57%, and 35% in comparison with that from the application of normal EDDS at 5 mmol kg(-1), respectively. For treatment with 1 mmol kg(-1) of EDDS, the leached metals decreased to the levels of the control group (that without EDDS amendment) 14 d after the application of EDDS. The soil amendment with biodegradable EDDS in hot solutions may provide a good alternative to chelate-enhanced phytoextraction in enhancing metal uptake by plants and limiting metals from leaching out of the soil.
通过盆栽试验，研究了在90℃热溶液中施用可生物降解螯合剂S,S-乙二胺二琥珀酸（EDDS）对玉米（Zea mays L. cv. Nongda No. 108）和豆类（P vulgaris L. white bean）吸收铜、铅、锌和镉的影响，以及金属从土壤中的潜在淋溶情况。当以1 mmol kg(-1)的用量将EDDS作为热溶液施用时，植物地上部金属的浓度和总植物提取量超过或接近以5 mmol kg(-1)的用量施用普通EDDS处理的植物地上部的水平。另一方面，与以5 mmol kg(-1)的用量施用普通EDDS相比，以1 mmol kg(-1)的用量施用热EDDS溶液后，铜、铅、锌和镉的淋溶分别减少了46%、21%、57%和35%。对于以1 mmol kg(-1)的用量施用EDDS的处理，施用EDDS后14天，淋溶出的金属降至对照组（未施用EDDS改良剂）的水平。在热溶液中用可生物降解的EDDS改良土壤，可能为螯合增强植物提取提供一个很好的替代方法，既能增强植物对金属的吸收，又能限制金属从土壤中淋溶出来。
