期刊
FORESTS
卷 13, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/f13020151
关键词
citric acid; fourier transform infrared (FTIR) spectroscopy; near-infrared (NIR) spectroscopy; quality control (QC); sorbitol; wood modification; X-ray density profiling
类别
资金
- Open Access Publication Funds of the Gottingen University
Recent studies have shown that treatments with sorbitol and citric acid (SorCA) can significantly improve the dimensional stability and biological durability of wood. In order to ensure uniform material performance, a quality control (QC) method is needed to determine if the fixated chemicals are homogeneously distributed within the wood. This study evaluated the use of Fourier transform infrared (FTIR) spectroscopy, near-infrared (NIR) spectroscopy, and X-ray density profiling to determine the degree of modification in SorCA-treated wood. The results showed that FTIR, NIR, and X-ray densitometry can serve as indicators of impregnation chemical distribution in SorCA-modified wood.
Recent studies showed treatments with sorbitol and citric acid (SorCA) to significantly improve the dimensional stability and biological durability of wood. The industrialization of this process requires a quality control (QC) method to determine if the fixated chemicals are homogenously distributed within the piece of wood, which is essential for uniform material performance. Therefore, the objective of this work was to evaluate the use of common electromagnetic radiation-based methods to determine the degree of modification in SorCA-treated wood. Both Fourier transform infrared (FTIR) spectroscopy and near-infrared (NIR) spectroscopy have been used to create rough calibrations for the weight percent gain (WPG) prediction models. The FTIR measurements resulted in a high linear correlation between the band area ratio (BAR) and the WPG (R-2 = 0.93). Additionally, a partial least square (PLS) regression of NIR spectroscopic data resulted in a model with a high prediction power (R-2 = 0.83). Furthermore, X-ray density profiling emerged as a simple alternative for the QC by showing a gradient of modification chemicals inside the sample and differences in chemical uptake between earlywood and latewood. Overall, it can be concluded that the results from FTIR, NIR and X-ray densitometry can serve as indicators of impregnation chemical distribution in SorCA-modified wood.
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