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You are here: Home » Latest Issue » Volume 13, 2018 - Number 2 » INFLUENCE OF RIVER WATER DIVERSION ON HYDROGEOCHEMISTRY AND REE DISTRIBUTION, RIO DE JANEIRO, BRAZIL. Carpathian Journal of Earth and Environmental Sciences, August 2018, Vol. 13, No. 2, p. 453 - 464; DOI:10.26471/cjees/2018/013/039


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Joanna Maria SANTOS-NEVES1, Eduardo Duarte MARQUES2, Vinicius Tavares KÜTTER1, Luiz Drude LACERDA3, Christian Joshua SANDERS1,4, Silvia Maria SELLA5 & Emmanoel Vieira SILVA-FILHO1*
1Universidade Federal Fluminense, Depto de Geoquímica, Instituto de Química, - Outeiro de São João Batista s/n – Centro - Niterói – RJ, 24020-141, Brasil. Email: joanna_cunha_santos@yahoo.com.br; viniciuskutter@yahoo.com.br; emmanoelvieirasilvafilho@id.uff.br
2Geological Survey of Brazil (CPRM), Belo Horizonte Regional Office, Av. Brasil, 1731 - Funcionários, Belo Horizonte – MG, 30140-002, Brasil. Email: eduardo.marques@cprm.gov.br
3Universidade Federal do Ceará, Laboratório de Biogeoquímica Costeira, Instituto de Ciências do Mar, Av. Abolição 3207, Fortaleza, CE 60165-081, Brasil. Email: ldrude@pq.cnpq.br
4National Marine Science Centre, School of Environment, Science and Engineering, Southern Cross University, P.O. Box 157, Lismore, NSW 2480, Australia. Email: christian.sanders@scu.eud.au
5Universidade Federal Fluminense, Depto de Química Analítica, Instituto de Química, - Outeiro de São João Batista s/n – Centro - Niterói – RJ, 24020-141, Brasil. e-mail: silviasella@id.uff.br


INFLUENCE OF RIVER WATER DIVERSION ON HYDROGEOCHEMISTRY AND REE DISTRIBUTION, RIO DE JANEIRO, BRAZIL. Carpathian Journal of Earth and Environmental Sciences, August 2018, Vol. 13, No. 2, p. 453 - 464; DOI:10.26471/cjees/2018/013/039

Full text

Abstract:

A previous study made by our group indicated that the changes in the rare earth element (REE) distribution pattern, within the upper 30cm of sediment column from Sepetiba bay, are related to Paraiba do Sul River (PSR) diversion. Here we show that REE fractionations in the water column are directly related with the construction of PSR and Guandu river watershed diversion system. Surface water samples were collected during the dry and wet season in specific sites along the transposition system. A tangential ultrafiltration system was used to obtain specific fractions: particulate (SPM load < 63 μm to > 0.1 μm) colloidal (colloidal load >10 kDa) and dissolved (dissolved load >1 kDa) fractions. The nutrients (H4SiO4, PO43-, F-, Cl-, SO42-, Na+, K+, Ca2+, and Mg2+) and REE were analyzed in each of fractions. The relatively large total REE concentrations found in the PSR diminished substantially when reaching the downstream section of the tributary, showing lower concentrations when compared to a nearby river unaffected by the diversion. Some of the factors that may control the self-purification of REE, include the trapping of the particulate fractions associated with suspended matter in dams along the basin, uptake of the dissolved fraction by aquatic plants in nutrient rich waters of the tributaries, and co-precipitation with oxides/hydroxides as the redox potential increased downstream from the water diversion. 



Keyword: particulate matter, ultrafiltration, colloidal fraction, rare earth elements, fluvial waters


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