Please use this identifier to cite or link to this item: http://repositorio.ufc.br/handle/riufc/66192
Type: Artigo de Periódico
Title: Mercury distribution, speciation and flux in the Sepetiba Bay tributaries, SE Brazil
Authors: Paraquetti, Heloisa Helena M.
Ayres, Gisele A.
Almeida, Marcelo Dominguez de
Molisani, Mauricio M.
Lacerda, Luiz Drude de
Keywords: Heavy metals - Mercury;Mercury Distribution;Speciation;Metais pesados - Mercúrio;Mercúrio - Distribuição;Especiação
Issue Date: 2004
Publisher: Water Research
Citation: PARAQUETTI, Heloisa Helena M.; AYRES, Gisele A.; ALMEIDA, Marcelo Dominguez de; MOLISANI, Mauricio; LACERDA, Luiz Drude de. Mercury distribution, speciation and flux in the Sepetiba Bay tributaries, SE Brazil. Water Research, Amsterdam, v. 38, p. 1439-1448, 2004.
Abstract: Dissolved gaseous Hg, reactive Hg, total dissolved Hg and particulate Hg concentrations were measured in samples of majors tributaries of the Sepetiba Bay, SE Brazil (Itimirim, Itingu@u, Guarda, Guandu, S*ao Francisco and Ita rivers), in dry and rainy seasons. The average Hg concentrations found varied from 0.02 to 0.18 ng L 1 for dissolved gaseous Hg, from 0.1 to 18.1 ng L 1 for reactive Hg, from 0.1 to 66.6 ng L 1 for total dissolved Hg and from 0.3 to 250 ng L 1 for particulate Hg. During the rainy season, a decrease in the dissolved Hg concentrations and an increase in the particulate Hg concentrations was observed. Positive correlations were found between the reactive Hg and the total dissolved Hg concentrations ðr ¼ 0:99Þ; between the particulate Hg and TSS concentrations ðr ¼ 0:82Þ and between total Hg and particulate Hg concentrations ðr ¼ 0:95Þ: The instantaneous Hg fluxes varied among rivers from 0.02 to 412 mg s 1 for total dissolved Hg and from 0.03 to 12,572 mg s 1 for particulate Hg. The log Kd varied from 3.76 to 6.43 and showed a significant increase in rainy season following an increase in particulate Hg and a decrease in dissolved Hg concentrations. These results suggest that erosion and runoff are the major pathways of Hg transport to rivers and eventually to Sepetiba Bay.
URI: http://www.repositorio.ufc.br/handle/riufc/66192
ISSN: 0043-1354
Appears in Collections:LABOMAR - Artigos publicados em revistas científicas

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