Structure of Humic Substances from Some Regions of the Amazon Assessed Coupling 3D Fluorescence Spectroscopy and CP/PARAFAC

Autor(es)

Santos, Cleber H. ^{[1, 2]} ; Nicolodelli, Gustavo ^[2] ; Romano, Renan A. ^{[3, 2]} ; Tadini, Amanda M. ^{[1, 2]} ; Villas-Boas, Paulino R. ^[2] ; Montes, Celia R. ^[4] ; Mounier, Stephane ^[5] ; Milori, Debora M. B. P. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[2] Embrapa Instrumentacao, BR-13560970 Sao Carlos, SP - Brazil

^[3] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[4] Univ Sao Paulo, Ctr Energia Nucl Agr, NUPEGEL, BR-13418900 Piracicaba, SP - Brazil

^[5] Univ Toulon & Var, PROTEE, EA 3819, F-83957 La Garde - France

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 26, n. 6, p. 1136-1142, JUN 2015.
• Citações Web of Science: 10

Resumo

The Amazon rainforest presents one of the greater biodiversity in the world and a huge and dynamic carbon reservoir, both in the vegetation and in the soil pools, so it is an attractive subject of study. In the present paper, humic acids from a toposequence of an Oxisol-Spodosol system associated with kaolin was studied using fluorescence emission-excitation matrix combined with parallel factor analysis. The combined techniques allowed to assess the intensities of the two different fluorophores associated with humic acid with core consistency diagnoses of 84.2%. The results for the Humiluvic Spodosol seem to corroborate the model of the supramolecular structure of humic acid, because the intensity ratio of fluorophores does not remain in the profile. Therefore, the use of these combined techniques can provide information about the transformation processes of humic substances in soils, becoming an interesting analytical tool for studying these substances of different soils. (AU)

• Processo FAPESP: 13/13013-3 - Caracterização das Substâncias Húmicas extraídas de Solos da Região Amazônica
• Beneficiário: Amanda Maria Tadini
• Modalidade de apoio: Bolsas no Brasil - Doutorado