Effects of past copper contamination and soil structure on copper leaching from soil

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Paradelo, Marcos, Moldrup, Per, Arthur, Emmanuel, Naveed, Muhammad ORCID: https://orcid.org/0000-0002-0923-4976, Holmstrup, Martin, López-Periago, Jose E. and de Jonge, Lis W. (2014) Effects of past copper contamination and soil structure on copper leaching from soil. Journal of Environment Quality, 42 (6). p. 1852. ISSN 0047-2425

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Abstract

Copper contamination affects biological, chemical, and physical soil properties and associated ecological functions. Changes in soil pore organization as a result of Cu contamination can dramatically affect flow and contaminant transport in polluted soils. This study
assessed the influence of soil structure on the movement of water and Cu in a long-term polluted soil. Undisturbed soil cores collected along a Cu gradient (from about 20 to about 3800 mg Cu kg−1 soil) were scanned using X-ray computed tomography (CT). Leaching experiments were performed to analyze tracer transport, colloid
leaching, and dissolved organic carbon (DOC) and Cu losses. The 5% arrival time (t0.05) and apparent dispersivity (lapp) for tracer breakthrough were calculated by fitting the experimental data to
a nonparametric, double-lognormal probability density function. Soil bulk density, which did not follow the Cu gradient, was the main driver of preferential flow, while macroporosity determined by X-ray CT (for pores >180 mm) proved the best predictor of solute transport. Higher preferential flow due to the presence of
well-aligned pores and small cracks controlled water movement in
compacted soil. Transport of Cu was rapid during the first flush (»1
pore volume) in association with the movement of colloid particles,
followed by slower transport in association with the movement of
DOC in the soil solution. The relative amount of Cu released was
strongly correlated with macroporosity as determined by X-ray CT,
indicating the promising potential of this visualization technique for
predicting contaminant transport through soil.

Item Type: Article
Identifier: 10.2134/jeq2013.05.0209
Subjects: Construction and engineering > Civil and environmental engineering
Depositing User: Muhammad Naveed
Date Deposited: 17 May 2018 14:57
Last Modified: 06 Feb 2024 15:57
URI: https://repository.uwl.ac.uk/id/eprint/5004

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