Application of Heavy Rare Earth Element Fingerprints in Discrimination of Pu 'er Old Plant Tea and Tableland Tea
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Abstract:
Pu 'er teas are divided into old plant tea and tableland tea according to their origins. Old plant tea has a unique aroma and quality distinctive from tableland tea. The preliminary investigation was carried out to examine the feasibility of rare earth elements in identifying old plant tea and tableland tea. The samples of the two kinds of teas were selected from Xishuangbanna state of Yunan province, and the contents of 15 rare earth elements (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Y, Er, Tm, Yb, Lu and Sc) from these Pu 'er teas were determined by inductively coupled plasma mass spectrometry (ICP-MS). The analysis of variance (ANOVA), principal component analysis (PCA) and discriminant analysis (DA) showed that the discrimination models were established by four key variables (La, Ce, Eu and Sc), in which 100% classification validation for both teas and 88.9% cross validation for plant tea and 94.4% for tableland tea. It is feasible to classification of old plant tea and tableland tea by using pattern recognition technique combining with heavy rare-earth element fingerprints .
