Andrade M D, Prasher S O, Hendershot W H
Department of Bioresource Engineering, McGill University, Macdonald Campus, Ste-Anne-de-Bellevue, Québec, Canada.
Environ Pollut. 2007 Jun;147(3):781-90. doi: 10.1016/j.envpol.2006.07.010. Epub 2007 Jan 9.
Three experiments were conducted to optimize the use of ethylenediaminetetraacetic acid (EDTA) for reclaiming urban soils contaminated with trace metals. As compared to Na(2)EDTA, (NH(4))(2)EDTA extracted 60% more Zn and equivalent amounts of Cd, Cu and Pb from a sandy loam. When successively saturating and draining loamy sand columns during a washing cycle, which submerged it once with a (NH(4))(2)EDTA wash and four times with deionised water, the post-wash rinses largely contributed to the total cumulative extraction of Cd, Co, Cr, Cu, Mn, Ni, Pb and Zn. Both the washing solution and the deionised water rinses were added in a 2:5 liquid to soil (L:S) weight ratio. For equal amounts of EDTA, concentrating the washing solution and applying it and the ensuing rinses in a smaller 1:5 L:S weight ratio, instead of a 2:5 L:S weight ratio, increased the extraction of targeted Cr, Cu, Ni, Pb and Zn.
进行了三项实验，以优化使用乙二胺四乙酸（EDTA）来修复受痕量金属污染的城市土壤。与Na₂EDTA相比，(NH₄)₂EDTA从砂壤土中提取的锌多60%，提取的镉、铜和铅量相当。在洗涤周期中，对壤质砂土柱进行连续饱和与排水操作，用(NH₄)₂EDTA洗涤液浸泡一次，并用去离子水浸泡四次，洗涤后的冲洗液对镉、钴、铬、铜、锰、镍、铅和锌的总累积提取量贡献很大。洗涤液和去离子水冲洗液均按2:5的液土重量比添加。对于等量的EDTA，将洗涤液浓缩并按较小的1:5液土重量比（而非2:5液土重量比）施加洗涤液及随后的冲洗液，可增加目标铬、铜、镍、铅和锌的提取量。
