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Bioresour Technol. 2010 Jun;101(11):3808-15. doi: 10.1016/j.biortech.2010.01.021. Epub 2010 Feb 1.

Proximate analysis, backwards stepwise regression between gross calorific value, ultimate and chemical analysis of wood.

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University of TrĂ¡s-os-Montes and Alto Douro (UTAD), Forestry Department, Quinta dos Prados Apartado, 1013-5001-801 Vila Real, Portugal.

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  • Bioresour Technol. 2010 Sep;101(18):7200.


The gross calorific value (GCV), proximate, ultimate and chemical analysis of debark wood in Portugal were studied, for future utilization in wood pellets industry and the results compared with CEN/TS 14961. The relationship between GCV, ultimate and chemical analysis were determined by multiple regression stepwise backward. The treatment between hardwoods-softwoods did not result in significant statistical differences for proximate, ultimate and chemical analysis. Significant statistical differences were found in carbon for National (hardwoods-softwoods) and (National-tropical) hardwoods in volatile matter, fixed carbon, carbon and oxygen and also for chemical analysis in National (hardwoods-softwoods) for F and (National-tropical) hardwoods for Br. GCV was highly positively related to C (0.79 * * *) and negatively to O (-0.71 * * *). The final independent variables of the model were (C, O, S, Zn, Ni, Br) with R(2)=0.86; F=27.68 * * *. The hydrogen did not contribute statistically to the energy content.

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