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纤维素是木材细胞壁的骨架物质,纤维素的含量不仅决定木材的性质,而且在木材的功能性改良方面对于木材的改性是非常重要的量化指标。传统纤维素含量的测定方法具有测定时间长、耗费药品且操作复杂等缺点。本论文基于傅里叶变换红外光谱(FTIR)分析测定木材中纤维素含量。以硫氰化钾为内标物,制备数个不同纤维素浓度的溴化钾片,然后以纤维素峰强度与硫氰化钾(内标物)峰强度比值对样品百分浓度作出工作曲线。不同木材的木粉与含有硫氰化钾的溴化钾粉压片后进行测量,根据混合物中纤维素特征峰强度与硫氰化钾峰强度比值,就可以从工作曲线上得到混合物中纤维素的百分含量,从而得到木材中纤维素的百分含量。试验结果表明:傅里叶变换红外光谱仪可以实现快速测定木材纤维素的含量。
Cellulose is the backbone of the cell walls of wood. The content of cellulose not only determines the properties of the wood, but also is a very important quantitative indicator of wood modification in the functional improvement of wood. Traditional methods of determination of cellulose content has a long measurement time, consumption of drugs and the complexity of the operation and other shortcomings. In this thesis, the cellulose content in wood was determined based on Fourier transform infrared spectroscopy (FTIR). Several potassium bromide tablets with different cellulose concentrations were prepared with potassium thiocyanate as internal standard. Then, the working curve of the percentage concentration of cellulose peak and the ratio of the peak intensity of potassium thiocyanate (internal standard) . Different wood and wood flour containing potassium bromide, potassium bromide powder tablet after measurement, according to the mixture of cellulose peak intensity characteristics and peak intensity ratio of potassium thiocyanate, the mixture can be obtained from the working curve of cellulose Of the percentage content of wood to get the percentage of cellulose. The experimental results show that the Fourier transform infrared spectrometer can quickly determine the content of wood cellulose.