Chemical dynamics of acidity and heavy metals in a mine water-polluted soil during decontamination using clean water

Chen, A. and Lin, C. and Lu, W. and Ma, Y. and Bai, Y. and Chen, H. and Li, J. (2010) Chemical dynamics of acidity and heavy metals in a mine water-polluted soil during decontamination using clean water. Journal of Hazardous Materials, 175 (1-3). pp. 638-645. ISSN 0304-3894


A column leaching experiment was conducted to investigate the chemical dynamics of the percolating water and washed soil during decontamination of an acidic mine water-polluted soil. The results show that leaching of the contaminated soil with clean water rapidly reduced soluble acidity and ion concentrations in the soils. However, only <20% of the total actual acidity in the soil column was eliminated after 30 leaching cycles. It is likely that the stored acidity continues to be released to the percolating water over a long period of time. During the column leaching, dissolved Cu and Pb were rapidly leached out, followed by mobilization of colloidal Cu and Pb from the exchangeable and the oxide-bound fractions as a result of reduced ionic strength in the soil solution. The soluble Fe contained in the soil was rare, probably because the soil pH was not sufficiently low; marked mobility of colloidal Fe took place after the ionic strength of the percolating water was weakened and the mobilized Fe was mainly derived from iron oxides. In contrast with Cu, Pb and Fe, the concentration of leachate Zn and Mn showed a continuously decreasing trend during the entire period of the experiment.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author version not held. Published version cannot be displayed.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 22 Sep 2010 03:39
Last Modified: 25 Aug 2014 03:26
Uncontrolled Keywords: mine water-contaminated soil; column leaching; acidity; heavy metal; soil decontamination
Fields of Research : 03 Chemical Sciences > 0301 Analytical Chemistry > 030108 Separation Science
05 Environmental Sciences > 0502 Environmental Science and Management > 050207 Environmental Rehabilitation (excl. Bioremediation)
05 Environmental Sciences > 0503 Soil Sciences > 050302 Land Capability and Soil Degradation
Socio-Economic Objective: D Environment > 96 Environment > 9612 Rehabilitation of Degraded Environments > 961205 Rehabilitation of Degraded Mining Environments
Identification Number or DOI: 10.1016/j.jhazmat.2009.10.055

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