Browsing by Author "Sousa, R."
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- Analytical protocol for the characterization of solid organic fractions: contribution for the biochemical and thermochemical potential assessment of biomass [Poster]Publication . Trancoso, Maria Ascensão; Crujeira, Teresa; Sousa, R.; Calisto, Sandra C.; Branco, J.; Oliveira, Ana Cristina; Passarinho, Paula; Abreu, Mariana; Moura, Patrícia; Gírio, FranciscoABSTRACT: In the scope of the CONVERTE project an optimised and uniformed methodology was developed in order to better evaluate the use of endogenous biomasses for energy production by biochemical or thermochemical processes. A protocol for preparation and characterization was designed and validated by the use of biomass certified reference materials and quality control actions. Extensive analytical work was performed and the results were summarized in accordance with their relevance for either biochemical or thermochemical processes.
- Application of factor analysis for the characterization of major and trace elements in surface sediments of the Minho estuaryPublication . Mil-Homens, Mário; Costa, Ana Novo; Fonseca, S.; Trancoso, Maria Ascensão; Lopes, Cristina Isabel; Serrano, R.; Sousa, R.
- Assessing the effects of the meteorological conditions on the pollen wall by EPMAPublication . Duque, L.; Guimarães, Fernanda; Ribeiro, H.; Sousa, R.; Abreu, I.
- Characterization of heavy-metal contamination in surface sediments of the Minho River Estuary by way of factor analysisPublication . Mil-Homens, Mário; Costa, Ana Novo; Fonseca, S.; Trancoso, Maria Ascensão; Lopes, Cristina Isabel; Serrano, R.; Sousa, R.
- Contribution to EPMA to airbone pollen analysisPublication . Guimarães, Fernanda; Duque, L.; Ribeiro, H.; Sousa, R.; Abreu, I.As a component of aerosol, pollen is found in suspension with other mineralogical and anthropogenic particles that can adhere to the pollen wall. The aim of this study was to determine possible alterations that pollen grains suffer under different meteorological conditions in the coastal city of Porto, Portugal. For this study, 2 airborne pollen types were taken into account: Poaceae and Alnus spp sampled in July 2010 and February 2011, respectively. Quantitative analysis and X-ray map analysis were performed with a Field Emission Electron Probe Microanalyser (EPMA). Samples were mounted over adhesive carbon tape and carbon coated. Control pollen showed mainly the presence of C, O, N, P, K, Mg, S, Cl and Ca in different quantities, depending on the considered species. Airborne pollen consistently revealed a higher content of Mg and Cl than control pollen, while Si, Ca, K and P contents varied differently according to the samples. Our results show that during their “flight”, pollen grains acquire an external coating, become heavier and change significantly their composition.
- Natural heavy metal and metalloid concentrations in sediments of the Minho River estuary (Portugal) : baseline values for environmental studiesPublication . Mil-Homens, Mário; Costa, Ana Novo; Fonseca, S.; Trancoso, Maria Ascensão; Lopes, Cristina Isabel; Serrano, R.; Sousa, R.
- Natural heavy metal concentrations in sediments of the Minho estuary, Portugal : baseline values for environmental studiesPublication . Mil-Homens, Mário; Costa, Ana Novo; Fonseca, S.; Trancoso, Maria Ascensão; Lopes, Cristina Isabel; Serrano, R.; Sousa, R.