Distribuição de mercúrio em diferentes solos da Bacia do médio Rio Negro-AM: influência da matéria orgânica no ciclo biogeoquímico do mercúrio
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Data
2007-04-01
Autores
Oliveira, Luciana Camargo de [UNESP]
Serudo, Ricardo Lima [UNESP]
Botero, Wander Gustavo [UNESP]
Mendonça, André Gustavo Ribeiro [UNESP]
Santos, Ademir dos [UNESP]
Rocha, Julio Cesar [UNESP]
Carvalho Neto, Fernando da Silva [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Química
Resumo
Soils play an important role in the biogeochemical cycle of mercury as a sink for and source of this metallic species to atmospheric and hydrological compartments. In the study reported here, various types of soil were evaluated to ascertain the influence of parameters such as pH, organic matter content, Fe, Al, sand, silt, clay, C/H, C/N, C/O atomic ratios, and cation exchange capacity on the distribution of Hg in Amazonia's mid-Negro River basin. The data obtained were interpreted by multivariate exploratory analyses (hierarchical cluster analysis and principal component analysis), which indicated that organic matter plays an important role in mercury uptake in the various soils studied. The soils in floodable areas were found to contain 1.5 to 2.8-fold higher Hg concentrations than those in non-floodable areas. Since these soils are flooded almost year-round, they are less available to participate in redox processes at the soil/atmosphere interface. Hence, floodable areas, which comprise humic-rich soils, accumulate more mercury than non-floodable soils, thus playing an important role in the biogeochemical cycle of Hg in Amazonia's mid-Negro River basin.
Descrição
Palavras-chave
soils, mercury distribution, Rio Negro-AM
Como citar
Química Nova. Sociedade Brasileira de Química, v. 30, n. 2, p. 274-280, 2007.