Content of mineral elements in wild-growing blueberry leaf teas.
2023
The concentrations of thirteen mineral elements (Ca, Cu, Fe, K, Mg, Mn, Na, Zn, Ni, Pb, Cd, Co and Cr) were determined in four different types of wild-growing blueberry leaf tea such as black tea, red tea, green tea and yellow tea. Plasma atomic emission spectrometer ICPE-9820 was used for qualitative and quantitative determination of the elements in the required concentration range, which is noted fot high sensitivity, wide dynamic range and high sample throughput. The amounts of essential elements slightly varied from one tea to the other, showing the unique mineral profile for each tea. In the blueberry leaf teas high content of Ca (13100 to 18800 mg/kg), K (7600 to 15300 mg/kg), Mg (4340 to 5900 mg/kg), Mn (2025 to 3350 mg/kg), Fe (1185 to 2335 mg/kg) and Na (1725 to 2285 mg/kg) was observed. Low concentrations were noted for Cu and Zn (34.0- 42.0 mg/kg, 26.8-59.5 mg/kg, respectively). Such elements as Cr and Ni were found under the limit of quantitation, whereas Pb, Cd and Co were under the limit of detection in all tea samples. Tab. 1, Ref. 20.
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