In Figure 1, samples from regions within China are closer to each other compared to the two Egyptian regions (Faiyum and Sikkim). Clear separation of each group is also achieved within the different Chinese regions. These results indicate that the elemental composition of teas is influenced by where the tea leaves are grown. Along the first dimension, explaining 70 percent of the total variance ratio, macro elements like Na, Mg, and Ca, micro elements like Sr, Zr, and Mo, as well as trace elements, including the rare earth elements La and Ce, were found to be higher in the Faiyum teas. Meanwhile, Mn, Ni, Zn, Rb, and Re were higher in the other teas, leading to the clear separation between the different regions.
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