Use este identificador para citar ou linkar para este item: http://repositorio.inpa.gov.br/handle/123/6045
Título: Substâncias húmicas aquáticas: fracionamento moleular e caracterização de rearranjos internos após complexação com íons metálicos
Autor(es): Ézio Sargentini Junior
Julio Cesar Rocha
André Henrique Rosa
Luiz Fabricio Zara
Ademir dos Santos
Assunto: substâncias húmicas aquáticas
fracionamento
metais
ISSN: 0100-4042
Revista: Química Nova
Volume: 24
Resumo: The aquatic humic substances (AHS) investigated in this study were conventionally isolated from Rio Negro waters – Amazonas State/Brazil by means of the collector XAD 8. A special five-stage tangential-flow ultrafiltration device was used for analytical fractionation of AHS. The fractionation patterns (6 fractions each) showed that metal traces remaining in AHS after their XAD 8 isolation have different size distributions. For instance, the major percentage of traces of Ni, Cu, Zn, Cd and Pb (determined using ICP-AES) was preferably complexed by molecules with relatively high molecular size (30-100 kDa) and the following complexation order was characterized: F2 >> F1 = F4 = F5 > F3 > F6. Moreover, the species formed between AHS and metals prepared by spiking, showed distribution patterns changing as a function of the complexation time (ageing process), indicating a slow transformation process and an inner rearrangements in the binding sites within the AHS molecules.
URI: http://repositorio.inpa.gov.br/handle/123/6045
ISSN: 0100-4042
DOI: http://dx.doi.org/10.1590/S0100-40422001000300010
Local de publicação: Brasil
Aparece nas coleções:Coordenação de Dinâmica Ambiental (CDAM)

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