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Simultaneous Determination of Potassium and Sodium in Cigarette Paper by Near Infrared Spectroscopy

SONG Yi1,2,LIU Wei2,DING Zhong-tao1(1.School of Chemical Science and Technology,Yunnan University,Kunming 650091,China;2.Dept.of Tobacco Science,Yunnan Academy of Tobacco Science,Kunming 650106,China)  
In order to meet the needs of rapid analysis of potassium and sodium in cigarette paper,the near infrared(NIR) spectra of 101 representative cigarette paper samples by measured by FT-NIR spectroscopy,and the contents of K and Na were determined by the chemical method.Based on the spectral data and determined chemical results,PLS calibration models were developed and optimized for the rapid quantitative analysis of K and Na,Results showed that it was suitable to use 14 papers to scan the samples.The optimized calibration ranges of K and Na were 4 000~7 700 cm-1.The preprocessing method was first derivative+Norris derivative filter.The correlation coefficients(R) of the models were 0.990 6 and 0.986 5,respectively,and the root mean square errors of cross validation(RMSECV) were 0.065 7 and 0.035 9,respectively.The average relative deviations between prediction values and determined chemical results were 9.63% and 9.03%,respectively.
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