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International Journal of Electrochemistry
Volume 2012 (2012), Article ID 563939, 5 pages
http://dx.doi.org/10.1155/2012/563939
Research Article

Identification of Four Wood Species by an Electronic Nose and by LIBS

1Instituto de Química, Universidade de São Paulo, Avenida Professor Lineu Prestes, 748, 05508-900 São Paulo, SP, Brazil
2Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Rua Santa Adélia, 166, 09210-170 Santo André, SP, Brazil
3Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Avenida Centenário 303, 13416-000 Piracicaba, SP, Brazil

Received 26 September 2011; Revised 5 November 2011; Accepted 10 November 2011

Academic Editor: Abel César Chialvo

Copyright © 2012 Juliana R. Cordeiro et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper presents two complementary methods capable of identifying four wood species (Cedrela fissilis, Ocotea porosa, Hymenolobium petraeum, and Aspidosperma subincanum) both by their volatile organic compounds and by the presence of 10 chemical elements: Al, B, Ca, Mg, Zn, Cu, Mn, Fe, Na, and Si. The volatile compounds were detected by an electronic nose formed by an array of three different conductive polymer gas sensors. The elemental determination was made by laser-induced breakdown spectrometry (LIBS). The emissions measured were treated by principal component analysis (PCA). Leave-one-out analysis showed a rate of hits of 100%.