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• W2331567222 abstract "O objetivo desse trabalho foi obter curvas de calibrações por meio da técnica de espectroscopia no infravermelho próximo (NIRS) para as propriedades teor de extrativos totais, lignina total e de holocelulose, usando espectros das faces radial, tangencial e transversal da madeira sólida. Foi utilizado um híbrido natural de Eucalyptus urophylla pertencente à empresa V&M Florestal, localizada no município de Paraopeba (MG). O híbrido tinha sete anos de idade e estava plantado em espaçamento de 3m x 3m. Os corpos-de-prova foram retirados ao longo de todo o fuste. O equipamento utilizado foi um espectrômetro da marca Bruker modelo MPA-R. Os espectros foram adquiridos na gama de 800 a 1.500 nm, em modo de reflexão difusa. Os modelos foram ajustados pelo método PLS-1. Foi utilizado o método da validação cruzada com pré-tratamentos de primeira e segunda derivada e remoção do espalhamento de luz. Pelos resultados conclui-se que: De maneira geral, os maiores valores de correlação foram obtidos a partir da média das faces tangencial, transversal e radial; as melhores calibrações foram obtidas quando aplicou-se o pré-tratamento de segunda derivada; melhores resultados: extrativos totais r = 0,66 e RPD = 1,3; teor de lignina total r = 0,70 e RPD = 1,5 e teor de holocelulose r = 0,66 e RPD = 1,4. Abstract The purpose of this study was to obtain calibration curves using Near Infrared Spectroscopy Technique (NIRS) for the determination of total extractive content, total lignin, and holocellulose, using the radial face, tangential, and transversal spectra of solid wood. We used a natural hybrid of Eucalyptus urophylla owned by V & M Florestal, located in Paraopeba city (MG). The hybrid was seven years old and was planted in 3m x 3m space. The soils-proof was taken throughout the shaft. The used equipment was a Bruker spectrometer brand model MPA-R. The spectra were acquired in the range from 800 to 1,500 nm in diffuse reflection mode. The models were fitted by PLS-1 method. We used the cross-validation method, the first and second derivative pre-treatment, and removal of scattered light. For the results it is ended that: Generally, the largest correlation values were obtained starting from the average of the tangential faces, transversal and radial; the best calibrations were obtained when the pre-treatment of derivative second was applied; better results: total extractive r = 0,66 and RPD = 1,3; content of total lignin r = 0,70 and RPD = 1,5 and holocelulose content r = 0,66 and RPD = 14." @default.
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• W2331567222 date "2011-04-01" @default.
• W2331567222 modified "2023-10-16" @default.
• W2331567222 title "Calibrações por meio da técnica da espectroscopia no infravermelho próximo para teor de extrativos totais, de lignina total e holocelulose usando espectros obtidos na madeira sólida" @default.
• W2331567222 doi "https://doi.org/10.5777/ambiencia.2011.01.03ac" @default.
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