Combined effects of low-molecular-weight organic acids on mobilization of arsenic and lead from multi-contaminated soils

Onireti, O, Lin, C and Qin, J 2017, 'Combined effects of low-molecular-weight organic acids on mobilization of arsenic and lead from multi-contaminated soils' , Chemosphere, 170 , pp. 161-168.

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Abstract

A batch experiment was conducted to examine the combined effects of three common low-molecularweight organic acids (LMWOAs) on the mobilization of arsenic and lead in different types of multicontaminated soils. The capacity of individual LMWOAs (at a same molar concentration) to mobilize soil-borne As and Pb varied significantly. The combination of the organic acids did not make a marked “additive” effect on the mobilization of the investigated three elements. An “antagonistic” effect on element mobilizationwas clear in the treatments involving oxalic acid for some soils. The acid strength of a LMWOA did not play an important role in controlling the mobilization of elements. While the mobilization of As and Pb was closely associated with the dissolution of soil-borne Fe, soil properties such as original soil pH, organic matter contents and the total amount of the element relative to the total Fe markedly complicated the mobility of that element. Aging led to continual consumption of proton introduced from addition of LMWOAs and consequently caused dramatic changes in solution-borne Fe, which in turn resulted in change in As and Pb in the soil solution though different elements behaved differently.

Item Type: Article
Schools: Schools > School of Environment and Life Sciences > Ecosystems and Environment Research Centre
Journal or Publication Title: Chemosphere
Publisher: Elsevier
ISSN: 0045-6535
Funders: Non funded research
Depositing User: C Lin
Date Deposited: 22 Dec 2016 13:51
Last Modified: 14 Dec 2017 18:06
URI: http://usir.salford.ac.uk/id/eprint/41048

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