Please use this identifier to cite or link to this item: https://app.uff.br/riuff/handle/1/19817
Title: EFEITOS DA TRANSPOSIÇÃO DE ÁGUAS SOBRE A DISTRIBUIÇÃO E FRACIONAMENTO DE ELEMENTOS TERRAS RARAS (ETR) DO RIO PARAÍBA DO SUL PARA A BAÍA DE SEPETIBA, RJ, BRASIL
Other Titles: Effects of Wate diversion in distribution and fractioning of rare earth elements (REE) from Paraíba do Sul river to sepetiba bay, RJ, Brazil
Keywords: Fracionamento geoquímico;  Elementos terras raras;  Ultrafiltração tangencial;  Mobilidade;  Geochemical fractionation;  Rare earth elements;  Cross flow filtration;  Mobility
Issue Date: 5-Jul-2012
Abstract: The geochemical fractionation of elements in essential for understanding the mobility, bioavailability and toxicity of chemical species in aquatic environments. The technique used for separation of colloids is tangential flow filtration (UF), according to this technique, the retention or rejection of compounds is accordingly molecular size, shape, ionic strength, pH and element concentration. This study aims to evaluate the role of particulate fraction, colloidal and truly dissolved in the transfer or rare earth elements (REE) from the middle course of Paraíba do Sul river to Sepetiba bay, using UF fractionation. The fractionation of REE is important because these chemical elements provide information about source, once these elements have similar chemical and geochemistry behavior. Considering this approach, water samples were collected at different sample stations, filtered through membranes of 0.1 μm, 10 kDa and 1 kDa, fractioning into particulate matter, colloids and truly dissolved. Then, REE concentrations were determined by ICP-MS. The UF proved to be an important tool in colloidal fractionation. It was observed a different behavior of REE between dry and rainy seasons, and the observed pattern indicate a preponderance of transport phenomenon of REE in rainy season, with higher concentrations, and predominantly associated with colloidal fraction. The REE behavior was similar between the reservoirs, indicating the influence of hidrochemical conditions on REE availability and mobilization in aquatic environments.
URI: https://app.uff.br/riuff/handle/1/19817
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