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Campo DC | Valor | Idioma |
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dc.contributor.author | Rocha, Júlio César | - |
dc.contributor.author | Junior, Ézio Sargentini | - |
dc.contributor.author | Toscano, Ilda Antonieta Salata | - |
dc.contributor.author | Zara, Luis Fabricio | - |
dc.contributor.author | Burba, Peter | - |
dc.date.accessioned | 2020-07-03T14:40:46Z | - |
dc.date.available | 2020-07-03T14:40:46Z | - |
dc.date.issued | 1999 | - |
dc.identifier.uri | https://repositorio.inpa.gov.br/handle/1/22447 | - |
dc.description.abstract | The aquatic humic substances investigated in this study were conventionally isolated from Rio Negro waters - Amazonas State/Brazil by means of the collector XAD 8. Molecular spectroscopy investigations of these humic substances using 1H-NMR and 13C-NMR indicated the presence of high aromaticity with few substituents, small amounts of carboxylic carbon, and an aliphatic/aromatic ratio of 1:1. The relatively high UV-VIS absorbance E350/E450 ratio suggested the presence of relatively large proportions of aliphatic structures. Moreover, using a five-stage tangential-flow ultrafiltration (UF) device, the molecular-size distribution of the isolated humic substances was characterized. The fractionation patterns showed that metal traces remaining in humic substances after their XAD 8 isolation have different size distributions. For instance, Mn, Cu, Cd and Ni quantified by ICP-AES were preferably found in the high molecular-weight fractions (10-100 kDa). | en |
dc.language.iso | en | pt_BR |
dc.relation.ispartof | Volume 10, Número 3, Pags. 169-175 | pt_BR |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Brazil | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/br/ | * |
dc.subject | Aquatic Humic Substances | en |
dc.subject | Rio Negro | en |
dc.subject | Nuclear Magnetic Resonance | en |
dc.title | Multi-method study on aquatic humic substances from the Rio Negro - Amazonas state/Brazil. Emphasis on molecular-size classification of their metal contents | pt_BR |
dc.type | Artigo | pt_BR |
dc.publisher.journal | Journal of the Brazilian Chemical Society | pt_BR |
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