Key Laboratory of Agroecological Processing and Safety Monitoring, Fujian Province, Fujian Agriculture and Forestry University, Fuzhou, China.
College of Life Sciences, Longyan University, Longyan, China.
J Sci Food Agric. 2020 Jun;100(8):3360-3369. doi: 10.1002/jsfa.10369. Epub 2020 Mar 22.
Rare earth elements (REEs) played an important role in enhancing the yield and quality of tea, and have been widely used in tea cultivation. In the present study, 3011 tea samples of four tea types, namely black tea, green tea, oolong tea and dark tea, were collected from the mainly tea producing areas in different provinces of China to analyze the contents of 16 REEs by inductively coupled plasma mass spectrometry.
The results obtained showed that the higher average content of REEs was 2.960 mg kg in black tea from Henan province, 2.500 mg·kg in green tea from Shanxi province, 3.870 mg·kg in oolong tea from Guizhou province and 2.955 mg·kg in dark tea from Hunan province. The sum percentage of five elements (Sc, Y, La, Ce, and Nd) to total REEs was 84.39% in black tea, 85.07% in green tea, 83.67% in oolong tea and 84.42% in dark tea. In addition, the content of Ce in tea was greatest, regardless of the province of China. The content trend of the five REEs was Ce > La > Sc > Nd > Y in black and green tea, respectively. However, the content trend was Ce > Y > Sc > Nd > La in oolong tea and Ce > Y > La > Nd > Sc in dark tea.
The tea leaves mainly accumulated light REEs rather than heavy REEs. These results provided an important theoretical basis for investigation of the accumulation characteristics of REEs in Chinese tea. © 2020 Society of Chemical Industry.
稀土元素（REEs）在提高茶叶产量和质量方面发挥着重要作用，已广泛应用于茶叶种植。本研究采集了来自中国不同省份主要产茶区的 3011 个红茶、绿茶、乌龙茶和黑茶茶样，采用电感耦合等离子体质谱法分析了 16 种 REE 的含量。
结果表明，河南省红茶中 REE 含量较高，平均值为 2.960mg·kg-1，山西省绿茶中 REE 含量较高，平均值为 2.500mg·kg-1，贵州省乌龙茶中 REE 含量较高，平均值为 3.870mg·kg-1，湖南省黑茶中 REE 含量较高，平均值为 2.955mg·kg-1。5 种元素（Sc、Y、La、Ce 和 Nd）占总 REE 的比例分别为红茶 84.39%、绿茶 85.07%、乌龙茶 83.67%和黑茶 84.42%。此外，无论来自中国哪个省份，茶叶中 Ce 的含量均最大。5 种 REE 在红茶和绿茶中的含量趋势分别为 Ce＞La＞Sc＞Nd＞Y，而在乌龙茶和黑茶中则为 Ce＞Y＞Sc＞Nd＞La。
茶叶主要积累轻 REE，而不是重 REE。这些结果为研究中国茶叶中 REE 的积累特征提供了重要的理论依据。 © 2020 英国化学学会。
