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Optimizing the Molarity of a EDTA Washing Solution for Saturated-Soil Remediation of Trace Metal Contaminated Soils

Optimizing the Molarity of a EDTA Washing Solution for Saturated-Soil Remediation of Trace Metal Contaminated Soils

M D Andrade, S O Prasher, W H Hendershot

Environ Pollut. 2007 Jun;147(3):781-90.

PMID: 17218042

Abstract:

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AS21113	Trace Metals - Sandy Loam 2			Price
AS21123	Trace Metals - Loamy Sand 4			Price

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