Sun Yuebing, Zhou Qixing, Wang Lin, Liu Weitao
Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, People's Republic of China.
Bull Environ Contam Toxicol. 2009 Mar;82(3):348-53. doi: 10.1007/s00128-008-9592-5. Epub 2008 Nov 11.
Application of synthetic chelates such as ethylene diamine tetraacetic acid (EDTA) has been proposed as an alternative technology for phytoextraction of contaminated soils. In a pot experiment, the effects of EDTA application at three growing stages on growth and Cd uptake and accumulation of Solanum nigrum L. were investigated. The results showed that the 0.1 g/kg EDTA treatment was the most effective treatment, in which the concentrations of Cd in stems and leaves increased significantly compared with the control (Cd only), and the accumulation of Cd in shoots increased by 51.6%, 61.1% and 35.9% at the seedling, flowering and mature stages, respectively. Moreover, at the flowering stage, the height, dry shoot biomass and Cd accumulation in the plants reached the maximum, which were 18.9 cm, 1.8 g/plant and 292.8 microg/pot, respectively. However, higher rate of EDTA (0.5 g/kg) could reduce the plant biomass and the total amount of Cd removed. The results indicated that moderate rate of EDTA applied at the flowering stage would be important to enhance phytoremediation efficiency in practice.
有人提出应用合成螯合剂如乙二胺四乙酸（EDTA）作为污染土壤植物提取的替代技术。在盆栽试验中，研究了在三个生长阶段施用EDTA对龙葵生长以及镉吸收和积累的影响。结果表明，0.1 g/kg EDTA处理是最有效的处理方式，与对照（仅镉处理）相比，该处理下茎和叶中的镉浓度显著增加，在幼苗期、开花期和成熟期，地上部镉积累量分别增加了51.6%、61.1%和35.9%。此外，在开花期，植株的高度、地上部干生物量和镉积累量均达到最大值，分别为18.9厘米、1.8克/株和292.8微克/盆。然而，较高剂量的EDTA（0.5 g/kg）会降低植物生物量和镉去除总量。结果表明，在开花期施用适量的EDTA对于提高实际植物修复效率具有重要意义。
