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(Referência obtida automaticamente do SciELO, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Interaction of Pb, Ni and Cd with Aquatic Humic Substances of Amazonian Blackwater Rivers

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Autor(es):
Isabela C. Constantino ; Juliana G. Viana ; Priscila A. Teixeira ; Altair B. Moreira ; Giovanna P. Gama ; Fabiana M. M. Paschoal ; Ézio Sargentini Jr. ; Márcia C. Bisinoti
Número total de Autores: 8
Tipo de documento: Artigo Científico
Fonte: Journal of the Brazilian Chemical Society; v. 32, n. 2, p. 260-268, Fev. 2021.
Citações Web of Science: 0
Resumo

In this study, the extraction and characterization of aquatic humic substances (AHS) from two blackwater rivers in the Amazon basin was carried out in order to assess the seasonal effects in the AHS structure. In addition, an investigation of the complexing capacities (CC) of the structures containing the metal ions CdII, NiII and PbII was also done. The characterization (of the AHS) was done using UV-Vis, molecular fluorescence, and infrared spectroscopy. AHS from the Negro River showed more aromatic characteristics in its structures and molecular weight, than the AHS from the Carú River. The AHS studied presented a seasonal pattern characterized by higher humification levels during the rainy season. For all the metals, the AHS complexing capacity was higher for the Negro River. The highest complexing capacities were observed for the NiII assays, which were 0.56 and 0.12 µmol NiII mg-1 dissolved organic carbon (DOC), for AHS RN and AHS RC-II, respectively. We concluded that the transport, bioavailability, and toxicity, of these metal species should be higher for Carú River. (AU)

Processo FAPESP: 05/51242-8 - Emprego de indicadores de qualidade de água e outras ferramentas de gestão ambiental para avaliar o efeito das atividades antrópicas sobre os rios Preto, Turvo e Grande na região de São José do Rio Preto
Beneficiário:Márcia Cristina Bisinoti
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
Processo FAPESP: 15/22954-1 - Transporte de metais e caracterização da matéria orgânica natural de rios da região de Itacoatiara, Amazônia
Beneficiário:Márcia Cristina Bisinoti
Linha de fomento: Auxílio à Pesquisa - Regular