Grant number: | 12/01957-4 |
Support Opportunities: | Scholarships in Brazil - Master |
Start date: | July 01, 2012 |
End date: | December 31, 2013 |
Field of knowledge: | Physical Sciences and Mathematics - Chemistry - Analytical Chemistry |
Principal Investigator: | Celio Pasquini |
Grantee: | Manassés Zuliani Jora |
Host Institution: | Instituto de Química (IQ). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil |
Abstract Among the atomizers used in atomic absorption spectrometry with electrothermal atomization (ETAAS), graphite furnace stand out for its good selectivity, requiring small sample volumes and low detection limits. However, these atomizers require high power sources and still present high cost of analysis. Alternatively, the use of tungsten as electrothermal atomizer in atomic absorption spectrometry has been the subject of research since 1970. However, based on atomic spectrometry tungsten filament atomizers presents several challenges related to understanding the generation of the atomic cloud and the effects observed in complex matrices. Furthermore, the technique does not present an adequate sensitivity for most refractory elements. Thus, the current work is aimed at assembling an atomic absorption spectrometer with a double tungsten filament and its application in the study of the generation of atomic cloud and the determination of refractory elements. It is intended, with that, using measurements of temperature, both on the surface of the filaments and in the gas phase, to elucidate the effects of interference in condensed phases and gaseous (ie interference caused by Na +, K +, Ca2 +, Mg2 +), from studies of Cd, Pb and Cr. Still, it is intended with this project, evaluate the application of the technique for samples with complex matrix. The use of two filaments should provide improvements in the atomization of the elements that can occur in an environment with lower temperature gradient, thereby reducing the chances of recombination and concomitant effects. | |
News published in Agência FAPESP Newsletter about the scholarship: | |
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Filed patent(s) as a result of this research project
DISPOSITIVO DE ESPECTROMETRIA DE ABSORÇÃO ATÔMICA; E CÉLULA DE ATOMIZAÇÃO ELETROTÉRMICA COM DUPLO FILAMENTO DE TUNGSTÊNIO BR1020140241876 - Universidade Estadual de Campinas (UNICAMP) . Célio Pasquini ; Manassés Zuliani Jora ; Jarbas José Rodrigues Rohwedder - September 2014, 29