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| Producing area identifying of tobacco leaf by X-ray fluorescence spectrometry based on discriminant analysis |
| 1.School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.School of Pharmacy, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract The quality of tobacco leaf is not only related to the variety and growth conditions,but also shows great relationship with soil and growing environment of original producing area. Based on the distribution difference of metallic elements in tobacco leaves from different producing areas, X-ray fluorescence spectrometry was proposed for rapid detection of metallic elements in tobacco leaves and combined with discriminant analysis for identifying the producing areas of tobacco leaves. Through analyzing the mean value of metallic elements in tobacco leaves from different producing areas, a big difference was observed among tobacco samples from different producing areas. By SPSS, an analytical model was established based on stepwise discriminant analysis of tobacco leaf samples from 4 producing areas with more contributed samples than other areas. The results show that when Cd, Rb, Ba, As and S were included as independent variables, the discrimination function has discriminative accuracy of back substitution of 92.9％ with cross validation accuracy of 90.5％. The identifying producing area of tobacco leaf by X-ray fluorescence analysis is highly feasible.
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Received: 18 November 2014
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2015, Vol. 36 
