Environmental impact assessment of a uranium mine, East Carpathians, Romania: Metal distribution and partitioning of U and Th

Lucian Petrescu 1 Essaïd Bilal 2, 3, 4
4 LMV-ENSMSE - Laboratoire Magmas et Volcans
CNRS - Centre National de la Recherche Scientifique : UMR6524, SPIN, Mines Saint-Étienne MSE - École des Mines de Saint-Étienne, LMV - Laboratoire Magmas et Volcans : UMR 6524
Abstract : ICP and XRF Spectroscopy methods were used to evaluate the metals (ppm) from soils for the mining dumps of Crucea-Botusana uranium deposit (Bistrita Mountains, Romania). The sequential extraction has emphasized the fact that U is associated with all the mineral fractions present in the soil samples. A great percentage of U can be found in the carbonate, organic and oxides fractions. The percentage of U detected in the exchangeable fraction is rather small. The fact that 21.77% of the total U can be found in the specifically absorbed and carbonate bound fraction, indicated the important role played by the carbonates in the retention of U; one the other hand this fraction is liable to release U if the pH should happen to change. Th appear in high-enough concentration in the soil is scarcely available because 70.29% is present in residual fraction, and about 21.78% in the organic and oxides fractions. This is certainly due to the fact that this naturally occurring radionuclide can be associated with relatively insoluble mineral phases like alumino-silicates and refractory oxides. Its association with the organic matter suggests that it can form soluble organic complexes that can facilitate its removal by the stream waters.
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Submitted on : Tuesday, August 2, 2011 - 4:01:48 PM
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  • HAL Id : emse-00613084, version 1

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Lucian Petrescu, Essaïd Bilal. Environmental impact assessment of a uranium mine, East Carpathians, Romania: Metal distribution and partitioning of U and Th. Journal of Earth and Environmental Sciences, 2007, 2 (1), pp.39-50. ⟨emse-00613084⟩

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