Espectroscopia NIR para diferenciação do carvão vegetal de três espécies nativas do cerrado

Abstract

In order to minimize the illegal deforestation of forests, the search for technologies that allow a quick identification of charcoal has spread in the forestry sector. Therefore, this work investigated the potential of Near Infrared Spectroscopy NIRS as a tool to differentiate coals produced from native cerrado species. Species samples were used: Handroanthus rosealba (ipê-branco), Piptocarpha rotundifolia (coração-de-negro) e Handroanthus heptaphyllus (ipê- roxo). For charcoal production used 12 specimens were used for each species, with approximate dimensions of 2.0 x 2.0 x 5.0 cm. The samples were carbonized in a muffle furnace using end temperatures of 500 °C and 550 °C. For the acquisition of the spectra the samples were reduced and separated by species and final carbonization temperature. Was used the the Portable Spectrophotometer DLP® NIRTM (Texas Instruments) with a range of radiation between 900 and 1700 nm. The spectra were processed in the software Unscrambler and treated with first and second derivatives of “Savitzky-Golay”. The principal component analysis (PCA) was used to differentiate the species studied. The PCA made it possible differentiate charcoal samples from native species of the cerrado. The portable NIR spectrum along with principal component analysis proved to be a tool with potential to differentiate charcoal from native species may be a methodology used to assist in the control and inspection of forest species.