1.Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China 2.Department of Chemistry, Tsinghua University, Beijing 100084, China
Abstract：Poplar and Eucalyptus were identified fast by Fourier transform infrared spectroscopy (FTIR) combined with two-dimensional correlation spectroscopy (2D) in the present paper.The two kinds of wood were similar to each other in one-dimensional IR spectra but quite different in 2D FTIR spectra.In the range between 800 and 1 500 cm-1, they are similar and three strong auto-peaks were aroused around 1 221, 954 and 879 cm-1in synchronous spectrum and four weak auto-peaks were aroused around 1 470, 1 150, 1 105 and 1 008 cm-1, respectively.In the range between 1 500 and 1 800 cm-1, one strong auto-peak appeared with Poplar around 1 665 cm-1 and one weak auto-peak appeared around 1 600 cm-1 in synchronous spectrum.They fromed one pair of cross-peaks, whereas three auto-peaks not only at 1 650 cm-1 but also at 1 725 and 1 600 cm-1 appeared with Eucalyptus and they became one 3×3 peak cluster.In addition, Eucalyptus has two weak auto-peaks at 1 580, 1 510 cm-1 and four negative cross-peaks at (1 725 and 1 580 cm-1), (1 650 and 1 580 cm-1), (1 600 and 1 580 cm-1) and (1 510 and 1 580 cm-1) and three positive cross-peaks at (1 725 and 1 510 cm-1), (1 650 and 1 510 cm-1) and (1 600 and 1 510 cm-1), respectively, which suggests that corresponding absorbance bands of Eucalyptus are more susceptive to the thermal perturbation than that of Poplar.The difference of 2D correlation between Eucalyptus and Poplar was obvious.The results proved that 2D correlation spectra could enhance the resolution of infrared spectra and increase the capacity of identification, which make it a powerful, rapid and new approach to identifying Eucalyptus and Poplar.
黄安民1,周群2,费本华1*,孙素琴2*. 杨木和桉木的二维相关红外光谱[J]. 光谱学与光谱分析, 2008, 28(08): 1749-1752.
HUANG An-min1,ZHOU Qun2,FEI Ben-hua1*,SUN Su-qin2*. Study on the Eucalyptus and Poplar by Generalized Two-Dimensional Infrared Correlation Spectroscopy. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(08): 1749-1752.
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