NIR Spectrometric Determination of Chlorine in Flue-cured Tobacco

Chemometrics was applied to data treatment in the rapid NIRS determination of chlorine in flue-cured tobacco. The method of partial least square was used in the establisment of analytical mathematical model through spectral pretreatment and step-by-step optimization,and the following parameters were obtained: correlation coefficient of the analytical model 0.989 6,RMSEC 0.019 0,RMSEP 0.085 6,RMSECV 0.038 5,PI 80 and main factor 16. The analytical model was tested by analysis of 57 typical samples for their chlorine contents by the present method. Average relative error of the results obtained were 10.41%. By applying the t-test to test the analytical results,no significant difference was found between the values found by the proposed method (i.e.,the NIRS method) and the method of trade standard.