Interaction between an acidic mine water and an agricultural soil material

Chen, A. and Lin, C. and Lu, W. and Ma, Y. and Bai, Y. and Chen, H. and Li, J. (2008) Interaction between an acidic mine water and an agricultural soil material. Geoderma, 148 (2). pp. 213-219. ISSN 0016-7061

Abstract

A column filtering experiment was conducted to investigate interaction between an acidic mine water and an agricultural soil material during percolation of the mine water through the soil column. The results show that the mine water-borne mineral acid, Cu, Pb, Zn and Cd was markedly held by the soil during the earlier stage of the experiment. Approximately 1/3 of the retained acid was only physically held by the soil while the remaining 2/3 of the retained acid was either physiochemically or chemically bound to soil colloids. There was a tendency that the retained acid decreased with increasing depth of the soil column. Except for Cd, the capacity of soil to remove these heavy metals from the mine water persisted longer, compared to mineral acid. In contrast with mineral acid, the concentration of retained heavy metals increased with increasing depth, suggesting that these metal ions are less competitive than major acidic cations such as Al3+, H+ and Fe3+ for available adsorption sites in the upper soil layers. Mine water-borne Cu, Cd and Pb were immobilized predominantly in exchangeable and oxide-bound forms while mine water-borne Zn was immobilized mainly in carbonate- and organic-bound forms. During mine water infiltration, some soil-borne metals were mobilized and leached out of the soil under acidic conditions during the latter stage of filtration operations. Unlike Cu, Pb, Zn and Cd, mine water-borne Fe was transformed into colloidal Fe oxides/hydroxides which were carried by the downflowing water. A large proportion of mine water-borne Mn was only physically held, probably not necessarily in soluble forms but in colloidal forms.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Depositing User: Dr Chuxia Lin
Faculty / Department / School: Current - USQ Other
Date Deposited: 01 Sep 2011 03:47
Last Modified: 16 Oct 2014 02:59
Uncontrolled Keywords: mine water; agricultural soil; mineral acid; heavy metals; percolation
Fields of Research (FOR2008): 09 Engineering > 0905 Civil Engineering > 090508 Water Quality Engineering
07 Agricultural and Veterinary Sciences > 0799 Other Agricultural and Veterinary Sciences > 079901 Agricultural Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
09 Engineering > 0914 Resources Engineering and Extractive Metallurgy > 091405 Mining Engineering
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9609 Land and Water Management > 960908 Mining Land and Water Management
Identification Number or DOI: doi: 10.1016/j.geoderma.2008.10.003
URI: http://eprints.usq.edu.au/id/eprint/18878

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