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dc.contributor.authorSeverino, Hemmely Guilhermond de Souzapt_BR
dc.contributor.authorPinto, Christiane Beátrice Duyckpt_BR
dc.contributor.authorSpigolon, André Luizpt_BR
dc.contributor.authorMello, Carlos Siqueira Bandeira dept_BR
dc.contributor.authorSilva, Taís Freitas dapt_BR
dc.contributor.authorLeal, Katia Zaccurpt_BR
dc.date.accessioned2022-12-02T04:54:19Zpt_BR
dc.date.issued2021pt_BR
dc.identifier.issn0100-4042pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/252231pt_BR
dc.description.abstractAsphaltenes fractions were extracted and purified from three heavy Brazilian oils. Their mass compositions of C, H, N, Ni and V were obtained from elemental analysis and S and O atomic percentages from EDS. The H/C ratios showed high degree of unsaturation, while the O atomic percentages indicated more pronounced biodegradation effects on two samples. Quantitative data on N, Ni, and V and semi-quantitative data on S were related to oils origins. The structural data of asphaltenes were explored by combining Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (1H NMR). The oil with the lower degree of biodegradation contained asphaltenes with a lower level of condensed aromatic rings and longer aliphatic chain substituents. The asphaltenes obtained from the two most biodegraded oils showed similarities of polar groups and the presence of carboxylic functions, as well as lower contents of aliphatic substituents. The quality and quantity of occluded hydrocarbons were assessed after the mild oxidation of the separated asphaltenes fractions. It was suggested that the severe biodegradation which altered these structures may also be responsible to affect their occluded hydrocarbons.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofQuímica Nova. São Paulo. Vol. 44, no. 4 (2021), p. 391-401pt_BR
dc.rightsOpen Accessen
dc.subjectAsphalteneen
dc.subjectAsfaltenopt_BR
dc.subjectHeavy oilen
dc.subjectBiodegradaçãopt_BR
dc.subjectBiodegradationen
dc.subjectHidrocarbonetos ocluídospt_BR
dc.subjectOccluded hydrocarbonen
dc.titleEvaluation of the chemical composition and structure of asphaltenes from there offshore brazilian biodegrades heavy oilspt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001137857pt_BR
dc.type.originNacionalpt_BR


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