Authors:M. Silva, M. Conceiçăo, M. Trindade, A. Souza, C. Pinheiro1, J. Machado, and P. Filho
The thermodynamic and kinetic parameters of the thermal decomposition of Zn(S2CNR2)2 complexes (R=CH3, C2H5 and n-C3H7) were determined with the dynamic thermogravimetric method. Superimposed TG/DTG/DSC curves show that thermal decomposition
reactions for chelates with R=C2H5 and n-C3H7 occur in the liquid phase, at temperatures far away from their melting points, whereas for the complex with R=CH3 the thermal decomposition begins at a temperature closer to its melting point, suggesting a rather complex decomposition
Authors:M. Vasconcellos, M. Saiki, G. Paletti, R. Pinheiro, R. Baruzzi, and R. Spindel
In the present work, determination of mercury in the head hair of populational groups living near a heavily industrialized region in São Paulo and of Indians living in the Xingu park in the Amazonic region, was carried out by instrumental neutron activation analysis. A control group of people with no suspicion of contamination by mercury was also studied. The range of mercury concentrations found up to now were: for the control group from 0.26 to 02.5 ppm; for the Indians from 6.9 to 34 ppm, and for the industrialized region inhabitants: from 0.30 to 3.0 ppm.
Authors:R. Godinho, H. Wolterbeek, M. Pinheiro, L. Alves, T. Verburg, and M. Freitas
The elemental microdistributions of peripheral and central parts of the lichen Flavoparmelia caperata exposed to industrial pollution were analysed, in order to better understand the elements distribution patterns in relation
to the lichen constitution, thereby increasing our knowledge on uptake and release mechanisms. Nuclear microscopy techniques
were used to visualize elemental distributions in sample transepts and associate their concentrations to sample morphology.
The distribution data of the elements studied suggests there is biological regulation of internal concentrations. Considering
thallus parts, element-specific internal translocation should be taken into account as one more factor affecting lichen “memory
Authors:S. Almeida, A. Silva, M. Freitas, A. Marques, C. Ramos, and T. Pinheiro
The growing concern about air quality in harbours is a result of the high impact of the operations on human health and environment.
Harbour activities such loading, unloading and transport of dusty materials are important emission sources of Atmospheric
particulate matter (APM). The assessment of these fugitive emissions is a difficult task because they depend on the materials,
the type of operation and the meteorological scenarios. The main objectives of this work were (1) to evaluate if the techniques
k0-based Instrumental neutron activation analysis (k0-INAA) and Particle induced X-ray emission (PIXE) are suitable techniques to assess fugitive emissions in harbours and (2)
to estimate the impact of harbour activities on APM levels and composition. Several experimental campaigns were carried out
in a Portuguese harbour, during unloading operations of fertilizer and phosphorite provided from Syria and Morocco. PM2.5 and PM2.5–10 were collected, in polycarbonate filters, by Gent samplers. The techniques k0-INAA and PIXE were applied as sensitive analytical tools to perform a complete chemical characterization of the collected
samples. Results showed that manipulation of these materials during harbour operations resulted in high emissions of particles,
principally from the coarse fraction. These emissions were very affected by the granulometry and nature of the handled materials.
Fertilizer emissions were characterized by high concentration of Ca, P, K, Cr, Br and Zn, whereas phosphorite handling contributed
principally for the increase of Ca, P and Cr levels.
Authors:A. Silva, S. Almeida, M. Freitas, A. Marques, C. Ramos, and T. Pinheiro
Harbour activities such as loading, unloading and transport of materials may be an important source of Atmospheric Particulate
Matter (APM). Depending on the materials, the type of operation and the meteorological conditions, these activities may have
an impact on the levels of APM around harbour areas. The aim of this work was to characterize the emissions of dust providing
from operations associated with phosphorite handling in harbours. Phosphorite is a non-detrital sedimentary rock which contains
high amounts of phosphate bearing minerals and is used for the production of phosphorous based fertilizers. When handled in
harbours frequently cause visual and environment impacts due to its physical and chemical characteristics. The techniques
Instrumental Neutron Activation Analysis and Particle Induced X-ray Emission were applied as sensitive analytical tools for
the determination of heavy metals and rare earth elements in phosphorite and in the APM sampled in the harbour during the
unloading operations. Results showed that manipulation of phosphorite during harbour operations resulted in high emissions
of particles, principally from the coarse fraction. These emissions were enriched in rare earth elements and heavy metals
and were very affected by the provenience of the phosphorite.
Authors:T. Pinheiro, A. Barreiros, L. Alves, M. Neres, R. Fleming, J. Silva, P. Filipe, and R. Silva
Skin as a manageable organ can provide direct or indirect information of tissue iron overload resulting from inherited disorders
as hemochromatosis. Patients with hemochromatosis were evaluated at three consecutive phases along the therapy programme.
Nuclear microprobe techniques were used to assess skin iron and Total Reflection X-ray Fluorescence to determine the plasma
iron concentrations. Results showed that iron pools were differently correlated at the three therapy phases. These variations
highlighted the value of skin iron content to assess organ iron deposition and therapy efficacy. Skin iron content can be
used for a better management of patients with iron overload pathologies.
Authors:C.M.M. Silveira, C.M. Della Lucia, M.R. Pirozi, T.A. Montini, and H.M. Pinheiro-Sant’Ana
This study aimed to optimize and validate methods for the analysis of thiamin and folic acid in fortified rice, pure and mixed to the milled rice (raw and cooked). The analysis was performed by high-performance liquid chromatography coupled to a diode array detector (HPLC—DAD). Different mobile phases were tested. Different ratios of organic modifier, pH ranges, triethylamine concentrations, and flow rates were used. For the validation, tests of recovery, repeatability, linearity, limit of detection (LOD), and limit of quantification (LOQ) were performed. The optimized methods showed good resolution of vitamins’ peaks, excellent recovery (82.6 to 104%), repeatability with relative standard deviation of peak areas, and retention times less than 10% and high coefficients of determination (0.9998 for thiamin and 0.9997 for folic acid). The LOD and LOQ were 0.00193 μg and 0.0193 μg for thiamin and 0.000934 μg and 0.00934 μg for folic acid. The optimized methods demonstrated reliability and sensitivity in the detection and quantification of these vitamins in fortified rice, pure and mixed to milled rice (raw and cooked). Furthermore, the methods were performed in isocratic mode, with short run time (<13 min), reflecting positively on the economy of reagents and analysis times.
Authors:M. F. Pinheiro da Silva, L. S. Soeira, K. R. P. Daghastanli, T. S. Martins, I. M. Cuccovia, R. S. Freire, and P. C. Isolani
Three different cerium citrate-based precursors were used for synthesizing CeO2 through thermal treatment. Three morphological types of CeO2 were obtained. Characterization of these oxides was carried out by XRD patterns, SEM microscopy, N2 adsorption isotherms, Raman spectroscopy, zeta potential, and UV/Vis luminescence. Ozonation of phenol catalyzed by CeO2 was studied as a representative reaction of environmental interest. The differences on the catalytic activity showed by these three oxides could be correlated to amounts of Ce3+ on CeO2 surface and, consequently, to the demand for oxygen needed to burn each precursor.