Caracterização química e macroscópica da madeira de dez espécies amazônicas expostas ao intemperismo natural

Abstract

This study aim to to evaluate the changes in the chemical and macroscopic wood’s properties of Apuleia leiocarpa Vog. Macbride (Garapeira), Calophyllum brasiliense Camb. (Guanandi), Dipteryx odorata (Aubl.) Willd. (Cumaru), Erisma uncinatum Warm. (Cedrinho), Hymenaea courbaril L. (Jatobá), Hymenolobium petraeum Ducke (Angelim-Pedra), Mezilaurus itauba (Meisn.) Taub. Ex Mez (Itaubá), Ocotea velutina Mart. (Canelão), Qualea paraensis Ducke (Cambará), Trattinnickia burserifolia Mart. (Amescla) in experiment of natural weathering. The test specimens had nominal dimensions of 2 x 2 x 10 cm (thickness x width x length); 70 proof bodies were prepared per species, and of these, 60 proof bodies were used for the natural weathering experiment, 5 specimens for the basic specific mass test and 5 specimens for chemical and macroscopic analysis. The exposure period to natural weathering was 360 days, and every ± 30 days samples were performed, where 5 proof bodies per species, were taken. From each sample, the evaluation of the chemical properties (lignin, extractives, ash and solubility in 1% Sodium Hydroxide) and macroscopic properties were analyzed. All species presented different responses of the variables as a function of the influence of natural weathering.