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BIBTEX RIS

Flood pulse and spatial dynamics of mercury in sediments in Puruzinho lake, Brazilian Amazon

2013; INSTITUTO NACIONAL DE PESQUISAS DA AMAZÔNIA; Volume: 44; Issue: 1 Linguagem: Inglês

10.1590/s0044-59672014000100010

ISSN

1809-4392

Autores

Ronaldo de Almeida, José Vicente Elias Bernardi, Ronaldo Cavalcante Oliveira, Dario Pires de Carvalho, Ângelo Gilberto Manzatto, Luiz Drude de Lacerda, Wanderley Rodrigues Bastos,

Tópico(s)

Heavy Metal Exposure and Toxicity

Resumo

The study was conducted in Puruzinho lake (Humaitá, AM) considering seasonal periods of rainy and dry in way to elucidate the flood pulse importance in the deposition, remobilization and distributions of mercury and organic matter in bottom sediments in the Madeira River Basin (Brazilian Amazon). Bottom sediments and soils samples were analyzed for total mercury and organic matter. Mercury concentrations obtained in bottom sediment were 32.20-146.40 ng g-1 and organic matter values were 3.5 - 18.0%. The main region for accumulation of mercury and organic matter was in the central and deepest lake area In the rainy season there was a greater distribution of Hg and organic matter, mainly controlled by means of income of the Madeira river water during flooding, while the predominant process in the dry season was the remobilization of total Hg due to the resuspension of bottom sediments.

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