Off-line TMAH-GC/MS and NMR characterization of humic substances extracted from river sediments of northwestern Sao Paulo under different soil uses

Autor(es)

Tadini, Amanda Maria ^[1] ; Pantano, Glaucia ^[1] ; de Toffoli, Ana Lucia ^[1] ; Fontaine, Barbara ^[2] ; Spaccini, Riccardo ^[2] ; Piccolo, Alessandro ^[2] ; Moreira, Altair Benedito ^[1] ; Bisinoti, Marcia Cristina ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Inst Biociencias Letras & Ciencias Exatas, Dept Quim & Ciencias Ambientais, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil

^[2] Univ Napoli Federico II, Ctr Interdipartimentale Ric Risonanza Magnet Nucl, CERMANU, I-80055 Portici - Italy

• Tipo de documento: Artigo Científico
• Fonte: Science of The Total Environment; v. 506, p. 234-240, FEB 15 2015.
• Citações Web of Science: 8

Resumo

Humic substances (HS) vary according to the physical and chemical factors present in the environment. Thus, the characterization of HS is very important because it improves the understanding of the groups that comprise the chemical structure. Sediment HS were extracted from four locations representative of sugar cane cultivation, pasture, urban area and the impoundment of the Agua Vermelha Hydroelectric Power Plant. Characterization using nuclear magnetic resonance (NMR) allowed us to infer that the HS from an area predominantly characterized by sugar cane cultivation (41.9%) and a typical rural area (35.0%) showed the highest aromaticity percentage. Using the off-line TMAH-thermochemolysis-GC-MS, we inferred that the HS of a typical rural area had a structure rich in plant waxes, plant biopolyester and a large amount of fatty acid methyl ester, which are related to the large amount of humic acid in the structure. The HS samples from the sugar cane cultivation area and the impoundment receiving all of the pollution load from the Turvo/Grande Hydrographic Basin (Bacia Hidrografica do Turvo/Grande-BHTG) contained contributions from compounds rich in lipids and fatty acid methyl esters, highlighting the presence of the breakdown of petroleum-derived hydrocarbons in the area receiving the entire pollution load. We conclude that the HS extracted from the sediments of the Preto, Turvo and Grande rivers showed well-defined characteristics that varied depending on soil use and occupation, especially the HS extracted from sediments sampled in areas typically planted with sugar cane and rural areas, whose structures contained more aromatic groups. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• 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: 12/23066-4 - O papel das substâncias húmicas aquáticas na disponibilidade de metais tóxicos e proposta de um indicador para labilidade de matéria orgânica em ambientes aquáticos
• Beneficiário: Márcia Cristina Bisinoti
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• 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
• Processo FAPESP: 12/06403-7 - Caracterização das substâncias húmicas aquáticas extraídas do Rio Preto
• Beneficiário: Amanda Maria Tadini
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Mestrado