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Sorption and Fractionation of Copper in soil at a sewage irrigation farm in Australia

journal contribution
posted on 2006-09-01, 00:00 authored by P Li, Francesco Stagnitti, G Allinson, N Turoczy, X Xiong, J Peterson
Copper (Cu) is an important heavy metal to be considered in soil contamination, because high concentrations of copper in soil produce toxic effects and may accumulate in plant tissues. In Australia's oldest sewage irrigation farm, located in Werribee, Victoria, soil in the land filtration area is contaminated by Cu. However, Cu content in herbage tissues is in the normal range and has been trending downward since 1979. Therefore, studies on the sorption capacity and sequential extraction of Cu in soil at the Werribee Farm is of significance, not only for better understanding the mechanism of transport, chemical processes, and plant uptake of Cu, but also in providing information for the practical management of sewage farm soils. Methods of combining sorption isotherms with sequential extraction procedures were adopted, and the results showed that the soil in the land filtration area at Werribee Farm has a high sorption capacity for Cu, and distribution coefficients, Kf of Cu, were 629 L kg-1 in surface soils (0-20 cm) and 335 L kg-1 in subsurface soils (20-40 cm). The sequential extraction fractions demonstrate that exchangeable and carbonate fractions are very low, only comprising 3.49 to 5.49% of total copper. The other fractions are also discussed. This characteristic of Cu in soil is related to the low concentration of Cu in plant tissues.

History

Journal

Communications in soil science and plant analysis

Volume

37

Issue

7-8

Pagination

1031 - 1042

Publisher

Taylor & Francis

Location

Philadelphia, Pa.

ISSN

0010-3624

eISSN

1532-2416

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2006, Taylor & Francis

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