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Mercury fluxes in the Rio Negro Basin, Amazon

Abstract

This thematic project is of strategic importance for Brazil since it intends to generate detailed knowledge about the dynamics of the chemical element mercury in the Negro River basin of the Amazon region. To attain this principal objective, the project unites a multi-institutional team from UNICAMP, UNESP and PUC-Campinas, which is engaged in quantifying the chemical componentes in the several potential reservoirs for mercury, as well as in measuring the flux of these species between water and the mechanisms and the controlling agents of these processes. To attain this principal objective, the team proposes the following activities: a) validation of analytical methods to determine mercury in the several matrices of interest, followed by quantification of mercury in the several reservoirs and determination of the metal flux between these reservoirs; b) study of the dynamics of transfer of mercury in the water/atmosphere interface, identifying and quantifying the fluxes between these matrices as well as the role played by such environmental parameters as the pH of the water, the intensity of solar radiation, the quantity of dissolved organic matter and the presence of natural oxidizing agents, in order to establish mechanisms which explain the formation and transfer of gaseous mercury; c) study of the dynamics of the transfer of mercury present in the soil to the atmosphere, identifying and quantifying the emission and deposition of gaseous mercury between these interfaces ande determining their dependence on the type of soil and the amount of plant coverage, as well as the influence of factors such as the humidity and temperature of the soil, the intensity of light and the temperature and humidity of the air; d) quantify the distribution of mercury in the river basin as a function of the type of soil, to establish the role that humic material has in the speciation of mercury in the soil and its leaching into the aquatic system. (AU)

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Scientific publications (11)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DA SILVA, GILMAR SILVERIO; JARDIM, WILSON F.; FADINI, PEDRO SERGIO. Photochemical Dissolved Gaseous Mercury (DGM) Formation/Consumption in the Negro River Basin, Brazilian Amazon. Journal of the Brazilian Chemical Society, v. 20, n. 8, p. 1549-1555, 2009. Web of Science Citations: 0.
DA SILVA, GILMAR SILVERIO; BISINOTI, MARCIA CRISTINA; FADINI, PEDRO SERGIO; MAGARELLI, GABRIELA; JARDIM, WILSON F.; FOSTIER, ANNE HELENE. Major Aspects of the Mercury Cycle in the Negro River Basin, Amazon. Journal of the Brazilian Chemical Society, v. 20, n. 6, p. 1127-1134, 2009. Web of Science Citations: 13.
OLIVEIRA, LUCIANA CAMARGO DE; SERUDO, RICARDO LIMA; BOTERO, WANDER GUSTAVO; MENDONÇA, ANDRÉ GUSTAVO RIBEIRO; SANTOS, ADEMIR DOS; ROCHA, JULIO CESAR; CARVALHO NETO, FERNANDO DA SILVA. Distribuição de mercúrio em diferentes solos da Bacia do médio Rio Negro-AM: influência da matéria orgânica no ciclo biogeoquímico do mercúrio. Química Nova, v. 30, n. 2, p. 274-280, Mar./Apr. 2007.
MÁRCIA CRISTINA BISINOTI; ÉZIO SARGENTINI JÚNIOR; WILSON F. JARDIM. Seasonal behavior of mercury species in waters and sediments from the Negro River Basin, Amazon, Brazil. Journal of the Brazilian Chemical Society, v. 18, n. 3, p. 544-553, 2007.
MÁRCIA CRISTINA BISINOTI; WILSON F. JARDIM; JOSÉ LAILSON BRITO JÚNIOR; OLAF MALM; JEAN REMY GUIMARÃES. Um novo método para quantificar mercúrio orgânico (Hg orgânico) empregando a espectrometria de fluorescência atômica do vapor frio. Química Nova, v. 29, n. 6, p. -, Dez. 2006.
PATRICIA MIRETZKY; MÁRCIA CRISTINA BISINOTI; WILSON F. JARDIM; JÚLIO CÉSAR ROCHA. Factors affecting Hg (II) adsorption in soils from the Rio Negro basin (Amazon). Química Nova, v. 28, n. 3, p. 438-443, Jun. 2005.
MAGARELLI‚ G.; FOSTIER‚ A.H. Influence of deforestation on the mercury air/soil exchange in the Negro River Basin‚ Amazon. Atmospheric Environment, v. 39, n. 39, p. 7518-7528, 2005.
MIRETZKY‚ P.; BISINOTI‚ M.C.; JARDIM‚ W.F. Sorption of mercury (II) in Amazon soils from column studies. Chemosphere, v. 60, n. 11, p. 1583-1589, 2005.
MÁRCIA CRISTINA BISINOTI; WILSON F. JARDIM. O comportamento do metilmercúrio (metilHg) no ambiente. Química Nova, v. 27, n. 4, p. -, Ago. 2004.
MÁRCIA CRISTINA BISINOTI; WILSON F. JARDIM. Production of organic mercury from Hg0: experiments using microcosms. Journal of the Brazilian Chemical Society, v. 14, n. 2, p. 244-248, Abr. 2003.
ROCHA‚ J.C.; SARGENTINI‚ É.; ZARA‚ L.F.; ROSA‚ A.H.; DOS SANTOS‚ A.; BURBA‚ P.; OTHERS. Reduction of mercury (II) by tropical river humic substances (Rio Negro)-Part II. Influence of structural features (molecular size‚ aromaticity‚ phenolic groups‚ organically bound sulfur). Talanta, v. 61, n. 5, p. 699-707, 2003.

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