Abstract：The variations of nearinfrared laser Raman spectra of ethanolwater solution for different volume concentration and temperature were investigated.The Raman spectra of ethanol water solution with volume concentrations from 0 to 100% were acquired at temperature range from 10 to 30 ℃ using a portable nearinfrared laser Raman spectrometer. The volume concentration predictive model was established with temperature and Raman spectrum values together to improve prediction accuracy. The results show that the correlation coefficient (Rc) of PLS model with temperature values is 0.997 6, and the root mean square error correction (RMSEC) is 1.94 with correlation coefficients of prediction models (Rp) more than 0.995 0. The overall forecast results are enough good and stable to meet the volume concentration determination of ethanol water solution at different temperatures, and the model has high applicable scope to meet actual detection requirements. The influences of temperature on ethanolwater solution were further clarified to establish the relationship between nearinfrared Raman spectroscopy and temperature. 11 PLS models of temperature were established at volume concentration interval of 10% from 0 to 100%. The results show that the correlation coefficient (R) are among 0.734 4 and 0.954 7. R values are increased with the increasing of volume concentration.
2015, Vol. 36 
