CONSTRUCTION OF AN ATOMIC ABSORPTION SPECTROMETER AND STUDIES ON THE FORMATION AND EVOLUTION OF THE ATOMIC CLOUD WITH ELETROTHERMAL ATOMIZATION IN A DOUBLE TUNGSTEN COIL SYSTEM

• 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.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

JORA, M. Z.; NOBREGA, J. A.; ROHWEDDER, J. J. R.; PASQUINI, C.. Double tungsten coil atomic absorption spectrometer based on an acousto-optic tunable filter. SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, v. 103, p. 1-8, JAN-FEB 2015. (08/57808-1, 12/01957-4)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

JORA, Manassés Zuliani. Construction of an atomic absorption spectrometer and studies on the formation and evolution of the atomic cloud with electrothermal atomization in a double tungsten coil system. 0000. Master's Dissertation - Universidade Estadual de Campinas (UNICAMP). Instituto de Química Campinas, SP.