Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/16783
Tipo: Artigo
Título: Frações da matéria orgânica e propriedades redox de substâncias húmicas em sedimentos de oceanos profundos
Autor(es): Baldotto, Marihus Altoé
Gobo, Arizoli Antonio Rosa
Salomão, Marcos Sarmet Moreira de Barros
Rezende, Carlos Eduardo
Camargo, Plínio Barbosa de
Abstract: Previous studies have verified that free radicals such as quinone moieties in organic matter participate in the redox reactions in natural systems. These functional groups were positively correlated with the increase in aromaticity and hydrophobicity of the humic substances. As an alternative to relatively complex and expensive spectroscopic methods, the redox properties of the humic substances, determined by potentiometric titrations, have been used to evaluate organic carbon stability in soil and sediments. The present study aimed to perform organic matter fractionation and isolation of humic substances from deep oceans in different isobaths (750; 1,050; 1,350; 1,650; 1,950 m) to determine their redox properties by iodimetric titrations under an inert atmosphere and specified conditions of pH and ionic strength. Sediment samples were collected to the North and South of platforms of petroleum exploration located in the North of Rio de Janeiro State, Brazil. Fractions of organic carbon and redox properties of humic substances varied with origin and depth of the samples and with position North and South of the petroleum exploration area.
Palavras-chave: Sediments
Organic carbon
Electrochemistry
Editor: Química Nova
Tipo de Acesso: Open Access
URI: http://dx.doi.org/10.1590/S0100-40422013000900003
http://www.locus.ufv.br/handle/123456789/16783
Data do documento: 27-Mai-2013
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