Fractionation of aquatic humic substances and dynamic of chromium species in an aquatic body influenced by sugarcane cultivation

Autor(es)

Tadini, Amanda M. ^[1] ; Moreira, Altair B. ^[1] ; Bisinoti, Marcia C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista Julio de Mesquita Filho UN, Inst Biociencias Letras & Ciencias Exatas, Dept Quim & Ciencias Ambientais, Lab Estudos Ciencias Ambientais, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 25, n. 1, p. 119-125, JAN 2014.
• Citações Web of Science: 2

Resumo

This study had as main objectiveto evaluate the influence of AHS obtained from an area under sugarcane cultivation on the dynamics of chromium species (Cr(III) and Cr(VI)). Was studied complexing capacity (CC) with the AHS of chromium species and these were characterized using UV/Vis spectrophotometry, molecular fluorescence, elemental analysis and infrared. AHS with and without fractionation showed a greater aromaticity degree and a predominance of humic acids, and the E4/E6 and E2/E4 ratios suggested aromatic rings and a greater contribution from plants, which indicates lignin structures. The highest CCs were observed for the AHS fractionated, being fraction with molecular-size < 10 kDa and 10-30 kDa showed the highest ability to complex Cr(III) and Cr(VI) ions, respectively. These results are corroborating with C/H/N and UV/Vis data, where we can conclude that the AHS without fractionation had the greatest aromaticity and a predominance of humic acids in their structure. (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
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 10/13879-2 - Interação entre substâncias húmicas e íons cromo e proposta de um indicador de matéria orgânica lábil
• Beneficiário: Amanda Maria Tadini
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 10/09271-9 - Avaliação da contaminação e dinâmica de metais em sedimentos, tecidos de peixes e amostras de água superficial de rios da Bacia Hidrográfica do Turvo/Grande
• Beneficiário: Márcia Cristina Bisinoti
• Modalidade de apoio: Auxílio à Pesquisa - Regular