Modelling the fate of chromated copper arsenate in a sandy soil

Mao, X., Barry, D. A., Li, L., Stagnitti, Frank, Allinson, G. and Turoczy, N. 2004, Modelling the fate of chromated copper arsenate in a sandy soil, Water, air and soil pollution: an international journal of environmental pollution, vol. 156, pp. 357-377.

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Title Modelling the fate of chromated copper arsenate in a sandy soil
Author(s) Mao, X.
Barry, D. A.
Li, L.
Stagnitti, Frank
Allinson, G.
Turoczy, N.
Journal name Water, air and soil pollution: an international journal of environmental pollution
Volume number 156
Start page 357
End page 377
Publisher Kluwer Academic Publishers
Place of publication Dordrecht, Netherlands
Publication date 2004-07
ISSN 0049-6979
1573-2932
Keyword(s) adsorption
exchange
PHREEQC-2
CCA
contaminant transport
Summary A pulse of chromated copper arsenate (CCA, a timber preservative) was applied in irrigation water to an undisturbed field soil in a laboratory column. Concentrations of various elements in the leachate from the column were measured during the experiment. Also, the remnants within the soil were measured at the end of the experiment. The geochemical modelling package, PHREEQC-2, was used to simulate the experimental data. Processes included in the CCA transport modelling were advection, dispersion, non-specific adsorption (cation exchange) and specific adsorption by clay minerals and organic matter, as well as other possible chemical reactions such as precipitation/dissolution. The modelling effort highlighted the possible complexities in CCA transport and reaction experiments. For example, the uneven dosing of CCA as well as incomplete knowledge of the soil properties resulted in simulations that gave only partial, although reasonable, agreement with the experimental data. Both the experimental data and simulations show that As and Cu are strongly adsorbed and therefore, will mostly remain at the top of the soil profile, with a small proportion appearing in leachate. On the other hand, Cr is more mobile and thus it is present in the soil column leachate. Further simulations show that both the quantity of CCA added to the soil and the pH of the irrigation water will influence CCA transport. Simulations suggest that application of larger doses of CCA to the soil will result in higher leachate concentrations, especially for Cu and As. Irrigation water with a lower pH will dramatically increase leaching of Cu. These results indicate that acidic rainfall or significant accidental spillage of CCA will increase the risk of groundwater pollution.
Language eng
Field of Research 090702 Environmental Engineering Modelling
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2004, Kluwer Academic Publishers
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008734

Document type: Journal Article
Collection: School of Ecology and Environment
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