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

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%.