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Title: | Aquatic humic substances: Molecular size fractionation and characterization of inner rearrangements after metal ions complexation |
Other Titles: | Substâncias húmicas aquáticas: Fracionamento molecular e caracterização de rearranjos internos após complexação com ÍONS metálicos |
Authors: | Junior, Ézio Sargentini Rocha, Júlio César Rosa, André Henrique Zara, Luiz Fabrício dos Santos, Ademir Bernardo |
Issue Date: | 2001 |
metadata.dc.publisher.journal: | Química Nova |
metadata.dc.relation.ispartof: | Volume 24, Número 3, Pags. 339-344 |
Abstract: | 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. |
metadata.dc.identifier.doi: | 10.1590/S0100-40422001000300010 |
Appears in Collections: | Artigos |
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