Fluorescence lifetime evaluation of whole soils from the Amazon rainforest

Autor(es)

Nicolodelli, Gustavo ; Tadini, Amanda Maria ; Nogueira, Marcelo Saito ; Pratavieira, Sebastiao ; Mounier, Stephane ; Clabel Huaman, Jose Luis ; dos Santos, Cleber Hilario ; Montes, Celia Regina ; Bastos Pereira Milori, Debora Marcondes

• Tipo de documento: Artigo Científico
• Fonte: APPLIED OPTICS; v. 56, n. 24, p. 6936-6941, AUG 20 2017.
• Citações Web of Science: 3

Resumo

Time-resolved fluorescence spectroscopy (TRFS) is a new tool that can be used to investigate processes of interaction between metal ions and organic matter (OM) in soils, providing a specific analysis of the structure and dynamics of macromolecules. To the best of our knowledge, there are no studies in the literature reporting the use of this technique applied to whole/non-fractionated soil samples, making it a potential method for use in future studies. This work describes the use of TRFS to evaluate the fluorescence lifetimes of OM of whole soils from the Amazon region. Analysis was made of pellets of soils from an oxisol-spodosol system, collected in Sao Gabriel da Cachoeira (Amazonas, Brazil). The fluorescence lifetimes in the oxisol -spodosol system were attributed to two different fluorophores. One was related to complexation of an OM fraction with metals, resulting in a shorter fluorophore lifetime. A short fluorescence lifetime (2-12 ns) could be associated with simpler structures of the OM, while a long lifetime (19-66 ns) was associated with more complexOM structures. This new TRFS technique for analysis of the fluorescence lifetime in whole soil samples complies with the principles of green chemistry. (C) 2017 Optical Society of America (AU)

• Processo FAPESP: 12/24349-0 - Desenvolvimento e avaliação de um sistema LIBS com pulso duplo: Aplicação em caracterização de solos
• Beneficiário: Gustavo Nicolodelli
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/07276-1 - CEPOF - Centro de Pesquisa em Óptica e Fotônica
• Beneficiário: Vanderlei Salvador Bagnato
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 11/03250-2 - Quantificação e dinâmica do carbono associado a horizontes espódicos profundos de solos da Floresta Amazônica, face a possíveis mudanças climáticas
• Beneficiário: Célia Regina Montes
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• 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