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|Title:||Fixation of metals in soil constituents and potential remobilization by hyperaccumulating and non-hyperaccumulating plants: Results from an isotopic dilution study|
|Citation:||Environmental Pollution, 2006; 143(3):407-415|
|Publisher:||Elsevier Sci Ltd|
|Daniel Hammer, Catherine Keller, Michael J. McLaughlin and Rebecca E. Hamon|
|Abstract:||In this study isotopic dilution methods were used to investigate the hypothesis that access to metals associated with specific chemical components in the soil that are not available to non-accumulator species could be involved in hyperaccumulation. The hyperaccumulator Thlaspi caerulescens and a non-accumulator species, Brassica napus, were grown in Cd and Zn enriched soil components calcite, goethite, charcoal and cryptomelane. The metal enriched components were aged to allow transformation of a proportion of added metals to non-labile forms. Results from the isotopic dilution L value method showed that despite taking up more metals, T. caerulescens accessed the same pool of metals as B. napus. Hence differential access to different solid-phase pools of metals appears to be an unlikely mechanism underlying metal hyperaccumulation. For all components except charcoal, L values for Cd and Zn were greater than the corresponding E values suggesting that E values may tend to underestimate the bioavailable fraction of metals in soils. Thlaspi caerulescens takes up more Cd and Zn than Brassica napus but from the same pools.|
|Keywords:||E value; L value; Thlaspi caerulescens; Brassica napus; soil components|
|Description:||Available online 7 February 2006.|
|Rights:||Copyright © 2006 Elsevier Ltd All rights reserved.|
|Appears in Collections:||Earth and Environmental Sciences publications|
Environment Institute publications
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