六安茶叶稀土元素含量分析

Content of rare earths elements in Lu’an tea

中文关键词:  六安茶叶  稀土元素  电感耦合等离子体质谱法

英文关键词:Lu'an tea  rare earth element  inductively coupled plasma-mass spectrometry

中文摘要:

      目的 了解六安茶区所产茶叶的稀土元素含量, 掌握茶叶稀土元素含量的分布情况。方法 采用电感耦合等离子体质谱法(inductively coupled plasma-mass spectrometry, ICP-MS)法对六安市主要产茶区的52个茶叶样品中16种稀土元素进行检测分析, 按照GB/T 5009.94-2012中计算出稀土元素氧化物总量残留, 从而得出全市主要茶区的茶叶中稀土元素残留量的分布, 同时比较不同茶类稀土元素氧化物含量, 进一步分析稀土元素残留量与茶叶品类之间的关系。结果 六安市主要茶区的稀土元素氧化物总量平均含量低于国家限量指标, 存在个别茶叶样品的稀土元素氧化物总量高于国家限量指标(2.0 mg/kg), 各茶区稀土元素残留分布呈明显差异, 总体结果为全市茶叶主产区稀土元素污染较小。分析各不同茶叶稀土元素含量情况, 发现瓜片的稀土元素含量高于其他茶叶。结论 茶叶稀土元素含量除了外在的施用化肥农药因素外, 还与茶叶的类别、茶叶的产地等因素要较大的关系。

英文摘要:

      Objective To understand the rare earth elements content of tea produced in Lu’an tea area and master the distribution of rare earth elements content of tea. Methods The detection and analysis of 16 rare earth elements in 52 tea samples of the main tea areas of Lu'an city were analyzed by inductively coupled plasma-mass spectrometry (ICP-MS) method. The content of rare earth elements oxides was calculated according to GB/T 5009.94-2012, and the distribution of rare earth elements residues in the tea leaves of the main tea area was obtained. At the same time, the relationship between rare earth elements residues and tea varieties was further analyzed by comparing the content of rare earth elements oxides. Results The average content of rare earth elements oxides in the main tea area of Lu'an was lower than the national limit, and the total amount of rare earth elements oxides in some individual tea samples were higher than the national limit (2.0mg/kg). The residual distribution of rare earth elements in the tea areas was obviously different, and the overall results showed that the rare earth elements in the tea areas of the whole city were less polluted. The content of rare earth elements content of different tea leaves was analyzed, and the content of rare earth elements of Guapian was higher than that of other tea leaves. Conclusion In addition to the external application of chemical fertilizer, the content of rare earths elements of tea leaves are related to the tea type and the origin of tea.