Journal
JOURNAL OF GEOCHEMICAL EXPLORATION
Volume 116, Issue -, Pages 51-59Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.gexplo.2012.03.006
Keywords
Chemical extraction; Mobility evaluation; Environmental risk
Categories
Ask authors/readers for more resources
Knowledge of the total concentration of metals in soils and sediments is frequently insufficient to ascertain environmental risk. Simple and sequential extractions are useful tools for estimating the mobility of metals. Many chemical extraction procedures have been proposed in the literature. This study compares the efficiency of three chemical extractions (two single procedures, using EDTA or HCl as reactant, and a sequential chemical extraction) on soils, riverine, estuarine and marine sediments. In the case of riverine sediments and soils, similar results are observed with 0.05 mol.L-1 EDTA or 0.2 mol.L-1 HCl extractions, whereas 0.2 mol.L-1 HCl is inefficient for marine or estuarine samples. Comparison of the results obtained for the various samples, suggests that it is necessary to use a unique procedure for all the samples. The use of 0.05 mol.L-1 EDTA rather than 0.2 mol.L-1 HCl, as reactant for the single extractions is recommended. The applied sequential extraction procedure is more aggressive than EDTA (except to evaluate Pb mobility for some samples). Assuming that the metal enrichments are mainly of anthropogenic origin and that these metals are of higher mobility, compared to native metals, it is concluded that, for estimation of metal mobility, EDTA leaching is better adapted for Pb, whereas the sequential extraction procedure is better suited for Zn and Cu. (C) 2012 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available