The use of near Infrared Spectroscopy to Identify solid wood Specimens of Swietenia Macrophylla0 (Cites Appendix II)

Abstract

Near infrared spectroscopy (NIRS) has been shown effective as a tool for identifying Swietenia when tested as laboratory-processed powder, but testing such powdered wood is not readily adaptable to the fieldidentification of wood. This study explored the efficacy of a fiber optic NIRS scan of solid wood surfaces to separate Swietenia macrophylla King, Carapa guianensis Aubl., Cedrela odorata L., and Micropholis melinoniana Pierre. Transverse, radial, and tangential surfaces were scanned to determine if the surface from which data were collected influenced the spectra recorded. Surfaces were scanned before and after removing the oxidized surface layer of the blocks to test effects of exposure on the spectra. Partial least squares for discriminant analysis models were developed for each taxon separately, based on a calibration set composed of at least 67 samples and a test set with at least 45 samples. The anatomical surface scanned, but not the presence of an oxidized layer, influenced the spectra for each species, necessitating the comparison of the same planes of section. The discriminant models showed small errors for each species, indicating that reliable identifications can be made with NIRS of solid wood surfaces in these species.

A geographical traceability system for Merbau (Intsia palembanica Miq.), an important timber species from peninsular Malaysia

“…These tools can be used to verify the claimed timber species and its geographic origin at discrete points along the supply chain from a logged forest to the point of sale [9]. The identity of timber species can be verified on the basis of wood anatomy [10], metabolic profiles [11], near-infrared spectroscopy [12] and DNA barcoding [13]. Geographic origin along the timber supply chain can be verified by tree rings [14], stable isotopes [15] and population structure [13,16].…”

Near infrared hyperspectral imaging and MCR-ALS applied for mapping chemical composition of the wood specie Swietenia Macrophylla King (Mahogany) at microscopic level

“…ACCEPTED MANUSCRIPT 13 The concentrations of holocellulose (cellulose+hemicellulose), lignin and extractives obtained using the conventional wet chemistry methods are shown in Table 1. These results were used as the average or global concentration for the wood sample.…”

“…[7]. In wood and wood-based materials, the rapid assessment of the chemical composition using NIR in applications related to the quality has provided an increasing number of publications for industrial applications in this area [8][9][10][11][12][13][14].…”

Estimation of physical and mechanical properties of timber members in service by means of infrared spectroscopy

“…Adedipe et al [26] reported an automatic algorithm for discrimination of two oak species (white and red oak) on the basis of NIR spectra. Pastore et al [27] and Braga et al [28] used NIR for determination of exotic wood species. Corresponding results were obtained by Wienhaus et al [29] but applying mid IR spectroscopy.…”