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Type: Journal article
Title: Short-term natural attenuation of copper in soils: Effects of time, temperature, and soil characteristics
Author: Ma, Y.
Lombi, E.
Nolan, A.
McLaughlin, M.
Citation: Environmental Toxicology and Chemistry, 2006; 25(3):652-658
Publisher: Setac
Issue Date: 2006
ISSN: 0730-7268
Statement of
Yibing Ma, Enzo Lombi, Annette L. Nolan and Mike J. McLaughlin
Abstract: Natural attenuation of metals added to soils refers to the processes by which the mobility and bioavailability/toxicity of the added metals decline with time. In this paper, we used isotopic dilution techniques to investigate the short-term (30 d) natural attenuation of Cu added to 19 European soils at two effective concentrations shown to inhibit plant (tomato) growth by 10 and 90%. The results showed that the lability of Cu added to soils rapidly decreased after addition, especially in the soils with pH > 6.0, followed by a slow decrease in Cu lability. The lability of Cu added to soils also decreased with increasing incubation temperature. The activation energies and the apparent diffusion rate coefficients for the attenuation processes were 33 to 36 kJ/mol and 0.66 to 20.9 × 10−10/s at 20°C, respectively, and were consistent with Cu diffusion in meso- and micropores. The attenuation of Cu lability was modeled on the basis of three processes: precipitation/nucleation of Cu on soil surfaces, Cu occlusion within organic matter, and diffusion of Cu into micropores. The soil and environmental factors governing attenuation rates were soil pH, organic matter content, incubation time, and temperature. Soil pH is the key factor for natural attenuation of Cu added to soils. The model can be used to scale ecotoxicological data generated from different soils and under different incubation times and temperatures.
Keywords: aging
natural attenuation
labile pool
Description: Copyright © 2006 Society of Environmental Toxicology and Chemistry
DOI: 10.1897/04-601R.1
Appears in Collections:Aurora harvest 6
Earth and Environmental Sciences publications
Environment Institute publications

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