稀土在有机茶园土壤-茶叶-茶汤系统中的迁移研究

Migration of rare earth elements in organic tea garden from soil through tea leaves to tea soup

中文关键词:  电感耦合等离子体质谱法  铁观音茶叶  稀土  迁移

英文关键词:inductively coupled plasma mass spectrometry  Tie Guanyin tea  rare earth elements  migration

中文摘要:

      目的 了解稀土在茶园土壤-茶叶-茶汤系统中的迁移情况, 指导科学饮茶, 为茶叶中稀土的形态研究和风险评估提供实验数据。方法 采集有机茶园中的土壤及其对应茶树上的茶叶样品, 经微波消解, 茶叶按照日常饮茶习惯冲泡, 用电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry, ICP-MS)测试各样品中的稀土含量。结果 土壤中约2.23%的稀土迁移到茶叶中, 按照日常饮茶习惯冲泡, 茶叶中约10.48%的稀土迁移到茶汤中。结论 茶叶采摘期不同, 产地不同, 迁移率也略有不同。平均每千克茶叶中, 有0.1198 mg的稀土被转移到茶汤中。

英文摘要:

      Objective To investigate the migration of rare earth elements in organic tea garden from soil through tea leaves to tea soup, so as to guide a scientific tea drinking habit, as well as to provide experimental data for the morphological research. Methods The samples of soil and tea were both collected from the organic tea garden and disposed by microwave digestion. The tea residue was prepared according to the daily drinking habits. The content of rare earth elements in these samples were determined by inductively coupled plasma mass spectrometry (ICP-MS). Results The results indicated that about 2.23% of the rare earth elements migrated into the tea leaves from the soil. According to the daily drinking habits, about 10.48% of total rare earth elements in the tea leaves were migrated into the tea soup. Conclusion Due to different picking time and origins of tea leaves, the migration rates are also slightly different. About 0.1198 mg of rare earth elements are transferred to the tea soup in per kilogram of tea.