NDLI: Spatial-temporal dynamics and sources of total Hg in a hydroelectric reservoir in the Western Amazon, Brazil.

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Spatial-temporal dynamics and sources of total Hg in a hydroelectric reservoir in the Western Amazon, Brazil.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Rezende, C. E. de Carvalho, D. P. Pestana, I. A. Almeida, M. G. Bastos, W. R. Souza, C. M. M.
Description	Country affiliation: Brazil Author Affiliation: Pestana IA ( Darcy Ribeiro State University of Northern Rio de Janeiro (Universidade Estadual do Norte Fluminense Darcy Ribeiro), Campos dos Goytacazes, RJ, Brazil. inacio@uenf.br.); Bastos WR ( Federal University of Rondônia (Universidade Federal de Rondônia), Porto Velho, RO, Brazil.); Almeida MG ( Darcy Ribeiro State University of Northern Rio de Janeiro (Universidade Estadual do Norte Fluminense Darcy Ribeiro), Campos dos Goytacazes, RJ, Brazil.); de Carvalho DP ( Federal University of Rio de Janeiro (Universidade Federal do Rio de Janeiro), Rio de Janeiro, RJ, Brazil.); Rezende CE ( Darcy Ribeiro State University of Northern Rio de Janeiro (Universidade Estadual do Norte Fluminense Darcy Ribeiro), Campos dos Goytacazes, RJ, Brazil.); Souza CM ( Darcy Ribeiro State University of Northern Rio de Janeiro (Universidade Estadual do Norte Fluminense Darcy Ribeiro), Campos dos Goytacazes, RJ, Brazil.)
Abstract	Damming rivers to construct hydroelectric reservoirs results in a series of impacts on the biogeochemical Hg cycle. For example, modifying the hydrodynamics of a natural watercourse can result in the suspension and transport of Hg deposits in the water column, which represents an exposure risk for biota. The objective of this study was to evaluate the influences of seasonality on the dispersion of total Hg in the Hydroelectric Power Plant (HPP)-Samuel Reservoir (Porto Velho/Brazil). Sampling campaigns were performed during the three following hydrological periods characteristic of the region: low (Oct/2011), ebbing (May/2012), and high (Feb/2013) water. Sediment profiles, suspended particulate matter (SPM), and aquatic macrophytes (Eicchornia crassipes and Oryza spp.) were collected, and their Hg concentrations and isotopic and elemental C and N signatures were determined. The drainage basin significantly influenced the SPM compositions during all the periods, with a small autochthonous influence from the reservoir during the low water. The highest SPM Hg concentrations inside the reservoir were observed during the high water period, suggesting that the hydrodynamics of this environment favor the suspension of fine SPM, which has a higher Hg adsorption capacity. The Hg concentrations in the sediment profiles were ten times lower than those in the SPM, indicating that large particles with low Hg concentrations were deposited to form the bottom sediment. Hg concentrations were higher in aquatic macrophyte roots than in their leaves and appeared to contribute to the formation of SPM during the low water period. In this environment, Hg transport mainly occurs in SPM from the Jamari River drainage basin, which is the primary source of Hg in this environment.
ISSN	09441344
Issue Number	10
Journal	Environmental Science and Pollution Research
Volume Number	23
e-ISSN	16147499
Language	English
Publisher	Springer
Publisher Date	2016-05-01
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Environmental Science Discipline Environmental Chemistry
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine

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