College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China.
Environ Pollut. 2012 May;164:204-10. doi: 10.1016/j.envpol.2012.01.031. Epub 2012 Feb 22.
One concern about the chelant-enhanced phytoextraction is the potential metal leaching associated with chelant application. A field study was carried out and the metal leaching along the 60-cm depth soil profiles were evaluated within 36 days after the biodegradable chelant EDDS was applied. Results showed EDDS significantly increased soluble Cu in the top 5 cm soil layer 1 day after the application, and the increase of soluble metals was generally limited in the top 20 cm soil. Metal speciation analysis indicated all Cu and Zn were in forms of Cu-EDDS and Zn-EDDS complexes in soil solution, and Ca was the major competitor with trace metals to EDDS. The soluble metals decreased quickly with time, and no significant difference was observed in the extractable Cu between EDDS treatments and the controls 22 days after the EDDS addition. The potential leaching associated with biodegradable EDDS addition may be controlled under field conditions.
一种螯合剂增强植物提取的担忧是与螯合剂应用相关的潜在金属浸出。进行了一项田间研究，在生物降解的 EDDS 应用后 36 天内，评估了沿 60 厘米深度土壤剖面的金属浸出。结果表明，EDDS 在施用后第 1 天显著增加了顶部 5 厘米土壤层中的可溶性 Cu，而可溶性金属的增加通常局限于顶部 20 厘米土壤。金属形态分析表明，土壤溶液中的所有 Cu 和 Zn 均以 Cu-EDDS 和 Zn-EDDS 配合物的形式存在，而 Ca 是与痕量金属竞争 EDDS 的主要物质。可溶性金属随时间迅速减少，在 EDDS 添加 22 天后，EDDS 处理与对照之间的可提取 Cu 没有显著差异。在田间条件下，可能控制与生物降解 EDDS 添加相关的潜在浸出。
