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• W2004465275 abstract "Plant uptake of radionuclides into the human food chain is one of many vectors used for calculating exposure rates and performing risk assessment. This study provides a pedogenic assessment of soil–plant relationships in terms of their relationships to nuclide bioavailability. The objectives of this study were (i) to identify associations of U and Th with pedogenic fractions and with soil properties, and (ii) to evaluate U and Th bioavailability in terms of soil processes. We collected composite samples of leaves, stems, AE and Bs horizons from 10 plots containing a Spodosol with naturally high levels of 238 U and 232 Th. Additional replicate subsamples of fine (<63 μm) soil material were also extracted with citrate–bicarbonate–dithionite (CBD), ammonium oxalate (AO), sodium pyrophosphate (PP), and Mehlich reagent (M3). Concentrations of 238 U and 232 Th were determined for soils and plants by neutron activation analysis or by gamma spectroscopy. Results indicated that Th was translocated preferentially to plant leaves while U showed little preferential translocation. The CBD extractant removed the most U and Th from soils. The PP extraction ranked second for U, and AO ranked second for Th removal. The M3 extraction was equally inefficient in the removal of both U and Th. Neither Th, nor Th uptake, was closely associated with organic fractions. In contrast, U distribution and plant uptake of U were more closely correlated to organically bound oxide fractions." @default.
• W2004465275 created "2016-06-24" @default.
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• W2004465275 date "2001-07-01" @default.
• W2004465275 modified "2023-10-16" @default.
• W2004465275 title "Pedogenic Fractionation and Bioavailability of Uranium and Thorium in Naturally Radioactive Spodosols" @default.
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• W2004465275 doi "https://doi.org/10.2136/sssaj2001.6541197x" @default.
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