Synchrotron-based X-ray microscopy for assessing elements distribution and speciation in mangrove tree-rings

Autor(es)

Novais Alves, Elton Eduardo ; Ortega Rodriguez, Daigard Ricardo ; Rocha, Pablo de Azevedo ; Vergutz, Leonardus ; Santini Junior, Luiz ; Hesterberg, Dean ; Ruiz Pessenda, Luiz Carlos ; Tomazello-Filho, Mario ; da Costa, Liovando Marciano

• Tipo de documento: Artigo Científico
• Fonte: RESULTS IN CHEMISTRY; v. 3, p. 10-pg., 2021-01-01.

Resumo

Micro-X-ray fluorescence (mu-XRF) spectroscopy has been used for dendrochemistry as a high spatial resolution, multi-elemental and non-destructive technique. Furthermore, micro-X-ray absorption near edge structure ( mu XANES) spectroscopy has a potential application in environmental studies by adding speciation information under in-situ conditions. Both, mu-XRF and mu-XANES, techniques were used to assess the inter-ring and intraring chemical content variations of Avicennia schaueria mangrove tree from Southeastern Brazil. Ca, Cl, K, P, and S were the major chemical elements distributed in almost all tree-rings. Ca was the most abundant element and showed a decreasing trend from heartwood to sapwood tree-rings. Calcium also showed a characteristic distribution pattern along the growth layer, acting as a chemical marker of growth layers. Ca chemical species were distinct in sapwood (calcium oxalate and carbonate-rich) and heartwood tree-rings (calcium sulfate-rich), showing different physiological Ca roles on tree performance. The synchrotron radiation-based techniques at micrometer scale provided information on the distribution and speciation of chemical elements within and between tree-rings. We also present a mu-XANES procedure for data collection and processing for dendrochemical studies. Altogether, we opened opportunities for further studies aiming to understand which environmental or physiological variables are responsible for tree-ring chemical speciation and distribution changes in tree species. (AU)

• Processo FAPESP: 18/22914-8 - Mudanças climáticas globais na floresta tropical amazônica avaliadas por multi-indicadores dendrocronológicos
• Beneficiário: Daigard Ricardo Ortega Rodriguez
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/08877-2 - Impactos das mudanças climáticas e ambientais na biogeoquímica de manguezais brasileiros
• Beneficiário: Elton Eduardo Novais Alves
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 09/53951-7 - EMU: implantação de laboratório multiusuário especializado em métodos de espectroscopia de infravermelho próximo (NIR) e de densitometria de raios X em aplicações agro-florestais
• Beneficiário: Mario Tommasiello Filho
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários