Diffusive Gradient In Thin Films (DGT) Compared With Soil Solution and Labile Uranium Fraction For Predicting Uranium Bioavailability To Ryegrass

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Abstract

The usefulness of uranium concentration in soil solution or recovered by selective extraction as unequivocal bioavailability indices for uranium uptake by plants is still unclear. The aim of the present study was to test if the uranium concentration measured by the diffusive gradient in thin films (DGT) technique is a relevant substitute for plant uranium availability in comparison to uranium concentration in the soil solution or uranium recovered by ammonium acetate. Ryegrass (Lolium perenne L. var. Melvina) is grown in greenhouse on a range of uranium spiked soils. The DGT-recovered uranium concentration (CDGT) was correlated with uranium concentration in the soil solution or with uranium recovered by ammonium acetate extraction. Plant uptake was better predicted by the summed soil solution concentrations of UO2 2 þ, uranyl carbonate complexes and UO2PO4. The DGT technique did not provide significant advantages over conventional methods to predict uranium uptake by plants.

Details

Original languageEnglish
Pages (from-to)140-147
JournalJournal of environmental radioactivity
Volume102
Issue number2
DOIs
Publication statusPublished - 4 Jan 2010

Keywords

  • Availability, Diffisuve gradient in thin films (DGT), Ryegrass, Selective extraction, Soil-to-plant transfer, Uranium, Labile fraction

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