Desenvolvimento de metodos analiticos usando espectrometria de raios X e quimiometria

TL;DRAbstract

This work presents an innovation in analytical chemistry dealing with new applications of X-ray fluorescence technique in which the X-ray scattering effects and the chemometric tools play essential roles.X-ray scattering spectra resulting from interaction of simple organic samples were obtained with two sources, a common bench top spectrometer equipped with a Rh tube and also with synchrotron radiation (from the XRF beam line of the Laboratório Nacional de Luz Síncrotron (LNLS), Campinas, SP, Brazil).Distinct scattering profiles are observed for both excitation sources: a continuum for synchrotron light and intense peaks related to Compton and Rayleigh effects when a Rh tube is used.After processing the spectra from both sources, it was observed that the high intensity of synchrotron radiation solved the intermediate precision problems found in measuring samples via Rh tube.In another study, the spectra of sweetners and vegetable oils were analysed by XRF with PCA and the results showe

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