Artículo
U and Th speciation in river sediments
Autor/es | Martínez Aguirre, Aránzazu
García León, Manuel Ivanovich, M. |
Departamento | Universidad de Sevilla. Departamento de Física Aplicada I Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Fecha de publicación | 1995 |
Fecha de depósito | 2022-09-19 |
Publicado en |
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Resumen | A study of the distribution of some natural radionuclides in different chemical fractions of river bottom sediments has been carried out. The study has shown that the majority of the total U in sediments is located in the ... A study of the distribution of some natural radionuclides in different chemical fractions of river bottom sediments has been carried out. The study has shown that the majority of the total U in sediments is located in the non-residual fractions, while Th is more likely to be present in the residual ones. This difference between U and Th reflects largely a much higher mobility of U relative to Th in surface and near-surface environments. Coprecipitation with amorphous ferromanganese oxyhydroxides is the main process of U and Th incorporation from the water column into the soil particles. Moreover, the distribution of the radionuclides and the analysis of the Th/U mass ratios in different chemical fractions of sediments has made an unequivocal connection between the enhanced U content in river sediments and the wastes discharged into the rivers by the operation of fertilizer industries. |
Cita | Martínez Aguirre, A., García León, M. y Ivanovich, M. (1995). U and Th speciation in river sediments. Science of the Total Environment, 173-174 (December 1995), 203-209. |
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