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

Almeida, Ronaldo de ; Bernardi, José Vicente Elias ; Oliveira, Ronaldo Cavalcante ; Carvalho, Dario Pires de ; Manzatto, Angelo Gilberto ; Lacerda, Luiz Drude de and Bastos, Wanderley Rodrigues (2013) Flood pulse and spatial dynamics of mercury in sediments in Puruzinho lake, Brazilian Amazon. [O pulso de inundação e a dinâmica espacial do mercúrio em sedimentos no lago Puruzinho, Amazônia Brasileira.] Acta Amazonica, 44 (1), pp. 99-106.

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Summary

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.

Summary translation

Este estudo foi realizado no lago Puruzinho (Humaitá, AM) considerando os períodos de cheia e seca para investigar a importância do pulso de inundação na deposição, remobilização e distribuição das concentrações de mercúrio e matéria orgânica nos sedimentos de fundo no lago da bacia do rio Madeira, na Amazônia brasileira. As amostras de sedimentos e solos foram analisadas para mercúrio total e matéria orgânica. As concentrações mercúrio no sedimento de fundo variaram entre 32,20 e 146,40 ng g-1 e as porcentagens de matéria orgânica variaram de 3,5 a 18,0%. A principal região de acumulação de mercúrio e de matéria orgânica foi na área central e mais profunda do lago. Na estação chuvosa ocorreu maior distribuição de Hg e de matéria orgânica controlada principalmente pelo pulso de inundação do rio Madeira, enquanto que no período de seca predominam os processos de remobilização de mercúrio devido a resssuspensão do sedimento de fundo.

EPrint Type:Journal paper
Keywords:Organic matter, Indicator kriging, Madeira River, Seasonality. Matéria orgânica, krigagem indicativa, Rio Madeira, Sazonalidade.
Agrovoc keywords:
LanguageValueURI
Englishorganic matterhttp://aims.fao.org/aos/agrovoc/c_5387
EnglishMadeira Riverhttp://aims.fao.org/aos/agrovoc/c_49970
EnglishSeasonalityhttp://aims.fao.org/aos/agrovoc/c_34117
EnglishFloodinghttp://aims.fao.org/aos/agrovoc/c_2980
Subjects: Environmental aspects > Biodiversity and ecosystem services
Environmental aspects
Knowledge management
Research affiliation: Brazil > Other organizations
ISSN:0044-5967
DOI:10.1590/S0044-59672014000100010
Deposited By: Baldasso, Heloísa Souza
ID Code:28995
Deposited On:18 Aug 2015 11:45
Last Modified:18 Aug 2015 11:45
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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