Diffusive gradient in thin films (DGT) for profiling leaching of CCA-treated wood waste mulch into the soil environment

Mercer, Theresa and Greenway, Gillian (2014) Diffusive gradient in thin films (DGT) for profiling leaching of CCA-treated wood waste mulch into the soil environment. International Journal of Environmental Analytical Chemistry, 94 (2). pp. 115-126. ISSN 0306-7319

Full content URL: https://doi.org/10.1080/03067319.2013.871712

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03067319.2013.871712

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Abstract

Chromated copper arsenate (CCA) is a common wood preservative that has been used worldwide. Studies have shown that there are leaching risks of the preservative components arsenic, chromium and copper. These risks include contamination of soil and water, resulting in toxic effects to humans, animals, plants and ecosystems. This study investigates leaching of the preservative components following exposure of the wood waste as mulch to soil and water. Diffusive gradient in thin films (DGTs) were used to quantify leaching of potentially bioavailable/dissolved forms of the elements along the soil profile. Speciation of chromium was also carried out. All elements were found to leach out of the wood. The containers that included CCA-treated wood waste as a mulch leached higher levels of arsenic, chromium and copper than the controls. The distribution was highest in the top 5 cm of the soil profile and decreased with depth. DGTs proved to be a useful, novel technique for measuring in situ leaching and speciation from waste materials into the environment.

Keywords:Cca-treated wood wastes, Chromated copper arsenate, DGT, Diffusive gradients, Novel techniques, Soil environment, Treated wood, Wood preservatives, Arsenic, Chromium, Copper, Fertilizers, Protective coatings, Soil pollution, Soils, Thin films, Wood preservation, Wood wastes, Wooden containers, Leaching
Subjects:F Physical Sciences > F850 Environmental Sciences
F Physical Sciences > F870 Soil Science
Divisions:College of Science > School of Geography
ID Code:34048
Deposited On:23 Nov 2018 10:08

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