Application of Heavy Rare Earth Elements as a Fingerprint in Discriminant Analysis of An’xi Tieguanyin Tea and Hua’an Tieguanyin Tea
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Abstract:
An’xi county and Hua’an county are two adjacent major producing areas of Tieguanyin tea in Fujian province. An’xi Tieguanyin tea and Hua’an Tieguanyin tea have their own characteristics, and it is difficult to distinguish between them and trace the producing area. In order to examine the feasibility of using rare earth elements as a fingerprint to distinguish An’xi Tieguanyin tea and Hua’an Tieguanyin tea, the contents of 16 rare earth elements (scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium) of two types of Tieguanyin tea samples were determined by inductively coupled plasma mass spectrometry (ICP-MS). The independent sample t test, principal component analysis and Wilk’s λ discriminant analysis were performed on the collected data, four variables (yttrium, praseodymium, gadolinium, and dysprosium) for effective identification were screened out, and discriminant models for An’xi Tieguanyin tea and Hua’an Tieguanyin tea were established: Y(Anxi)=37.363 Y+1.721 Pr-84.449 Gd+47.502 Dy-3.187, Y(Hua’an)=61.613 Y + 3.684 Pr-195.506 Gd+267.901 Dy-9.938, in which the differentiation rates for producing area validation and cross validation were both 92.2%. Therefore, it is feasible to distinguish An’xi Tieguanyin tea from Hua’an Tieguanyin tea by using heavy rare-earth elements as a fingerprint.
