Papers by Marcio Reboucas
Comprehensive Analytical Chemistry, 2008
Vibrational Spectroscopy, 2010
Analytica Chimica Acta, 2007
Quimica Nova, 2005
In this paper, we present and discuss the chemist's education profile in Brazil from the points o... more In this paper, we present and discuss the chemist's education profile in Brazil from the points of view of the academy and the industry. We emphasize that the chemistry courses need urgently to face the following challenge: to improve the undergraduate's interdisciplinary approach, management abilities and interpersonal relationships.
Chemometrics and Intelligent Laboratory Systems, 2011
Journal of Analytical Atomic Spectrometry, 2003
Journal of Analytical Atomic Spectrometry, 2006
Vibrational Spectroscopy, 2007
Vibrational Spectroscopy, 2011
Journal of Near Infrared Spectroscopy, 2001
P otentiometric titration using silver nitrate for determination of sulfide and mercaptide ions, ... more P otentiometric titration using silver nitrate for determination of sulfide and mercaptide ions, as defined by the UOP Method 209, has been widely used for quality control of Spent Caustic Neutralization Unit in petroleum industries. However, it has been found this procedure does not provide accurate results for samples taken from units based on Wet Air Oxidation (WAO) technology. Therefore, possible sources of error, such as concominant species, between-analytes interference and titration solvent, were investigated and adjustments in the method were proposed. Aqueous media should be used to prepare the titration solution instead of the recommended alcoholic solvent which was found to be related to the quite low analyte recoveries in WAO unit samples. The modified method can be successfully applied to samples with different chemical compositions which is the main advantage over the reference procedure. Limit of detection and relative standard deviation of 0,5 mg.L -1 and 5,2% for sulfide and 0,6 mg.L -1 and 5,5% for mercaptide were achieved.
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Papers by Marcio Reboucas