Analysis of lanthanides and actinides in sea sediments from the Gulf of Tehuantepec |
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Authors: | Eduardo Ordó?ez-Regil Genoveva García-Rosales and Omar Eduardo Gutiérrez-Mu?iz |
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Institution: | (1) Instituto Nacional de Investigaciones Nucleares. Chemistry Department, A.P. 18-1027, 11801 M?xico, D.F, Mexico;(2) Instituto Tecnol?gico de Toluca. Unidad de Postgrado, Ex Rancho la Virgen s/n, Metepec, 50120 Toluca, Mexico;(3) Instituto Tecnol?gico de Toluca. Unidad de Postgrado, Ex Rancho la Virgen s/n, Metepec, 50120 Toluca, Mexico |
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Abstract: | Seawater contains trace elements in solution, such as lanthanides and uranium, which can act as natural tracers when they
flocculate to form the sediments of the seabed. Uranium is a special case because it is a radioactive element with isotopic
ratio close to 1.14 (234U/238U) in sea water. Uranium is also present in all fractions of sediments, although the isotopic ratio in each fraction takes
a specific value depending on its origin and surrounding environment. This work has been conducted in order to analyze lanthanides
and uranium in a core of sea sediments. It is focused on separating the fractions forming the layers along the depth profile
of the core sample so as to determine the 234U/238U activity ratios in fractions of organic matter, aquatic life skeletons and dissolved minerals. The Neutron Activation Analysis
showed the presence of U, Lu, Hf, Eu, Ce and Yb ranging up to 50 ppm while alpha spectrometry gave a series of 234U/238U activity ratios which are discussed on the basis of statistical analysis. |
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