Structural description of humic substances from subtropical coastal environments using elemental analysis, FT-IR and 13C-solid state NMR data

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dc.contributor.authorSierra, M. M.D.
dc.contributor.authorGiovanela, M.
dc.contributor.authorParlanti, E.
dc.contributor.authorEsteves, V. I.
dc.contributor.authorDuarte, A. C.
dc.contributor.authorFransozo, A. [UNESP]
dc.contributor.authorSoriano-Sierra, E. J.
dc.contributor.institutionUniversidade Federal de Santa Catarina (UFSC)
dc.contributor.institutionUniversidade de Caxias do Sul (UCS)
dc.contributor.institutionUniversité Bordeaux I
dc.contributor.institutionUniversidade de Aveiro
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2022-04-28T20:01:13Z
dc.date.available2022-04-28T20:01:13Z
dc.date.issued2005-01-01
dc.description.abstractElemental composition and spectroscopic properties (FT-IR and CP/MAS 13C-NMR) of sedimentary humic substances (HS) from aquatic subtropical environments (a lake, an estuary and two marine sites) are investigated. Humic acids (HA) are relatively richer in nitrogen and in aliphatic chains than fulvic acids (FA) from the same sediments. Conversely, FA are richer in carboxylic groups and in ring polysaccharides than HA. Nitrogen is mostly present as amide groups and for lake and marine HS the FT-IR peaks around 1640 cm-1 and 1540 cm-1 identify polypeptides. Estuarine HS exhibit mixed continental-marine influences, these being highly influenced by site location. Overall, the data suggest that aquatic and mixed HS are more aliphatic than has been proposed in current models and also that amide linkages form an important part of their structural configuration.en
dc.description.affiliationDepartemento de Química Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC
dc.description.affiliationCentro Tecnológico (CETEC) Universidade de Caxias do Sul (UCS)
dc.description.affiliationDepartamento de Física e Química (DEFQ) Centro de Ciências Exatas e Tecnologia (CCET) Universidade de Caxias do Sul (UCS), 95070-560 Caxias do Sul, RS
dc.description.affiliationLaboratoire de Physico-Toxicochimie des Systèmes Naturels (LPTC) UMR 5472 CNRS Université Bordeaux I, 351 Cours de la Libération, 33405 Talence Cedex
dc.description.affiliationDepartamento de Química Universidade de Aveiro, 3810-193 Aveiro
dc.description.affiliationDepartamento de Zoologia Universidade Estadual Paulista, 18618-000 Botucatu, SP
dc.description.affiliationNúcleo de Estudos do Mar (NEMAR) Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC
dc.description.affiliationUnespDepartamento de Zoologia Universidade Estadual Paulista, 18618-000 Botucatu, SP
dc.format.extent370-382
dc.identifier.citationJournal of Coastal Research, v. 21, n. SPEC. ISS. 42, p. 370-382, 2005.
dc.identifier.issn0749-0208
dc.identifier.scopus2-s2.0-22444434581
dc.identifier.urihttp://hdl.handle.net/11449/224572
dc.language.isoeng
dc.relation.ispartofJournal of Coastal Research
dc.sourceScopus
dc.subjectCoastal marine
dc.subjectEstuary
dc.subjectFulvic acids
dc.subjectHumic acids
dc.subjectInfrared spectroscopy
dc.subjectLake
dc.titleStructural description of humic substances from subtropical coastal environments using elemental analysis, FT-IR and 13C-solid state NMR dataen
dc.typeArtigo

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