福建省地产茶叶中稀土元素的组成特征及分布模式的研究

Composition and distribution patterns of rare earth elements in Fujian teas

目的了解福建省地产茶叶中稀土元素的组成特征及分布模式。方法从福建省主要产茶地区的产地和市场随机抽取9个茶叶品种共145份样品,采用微波消解-电感耦合等离子体质谱法(ICP-MS)测定样品中镧(La)、铈(Ce)、镨(Pr)、钕(Nd)、钐(Sm)、铕(Eu)、钆(Gd)、铽(Tb)、镝(Dy)、钬(Ho)、铒(Er)、铥(Tm)、镱(Yb)、镥(Lu)、钇(Y)等15种稀土元素含量。结果福建茶叶中稀土总量、轻稀土、重稀土含量分别为2.483、1.764、0.720 mg/kg,组成特征以轻稀土元素为主,Ce含量最高,表现为轻稀土富集,轻、重稀土之间存在着明显的分馏作用,茶叶与相应的土壤中REE含量分布曲线形状基本相似。结论在球粒陨石标准化处理后,福建茶叶与福建土壤、中国大陆土壤的REE分布模式接近,也与江苏绿茶中稀土间的相关性和分布模式相似。福建省部分地区茶叶稀土含量较高须引起重视。

：Objective To investigate the composition and distribution pattern of rare earth elements in the teas from Fujian province. Methods A total of 145 samples of nine varieties of the teas were collected from their plantation fields and markets in Fujian province. The concentrations of La, Ce, Pr, Nd, Sin, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y in the samples were determined by inductively coupled plasma-mass spectrometry （ICP-MS）. Results The concentrations of total REEs , light REEs （LREEs） and heavy REEs（HREEs） in the teas were 2. 483,1.764,0.720 mg/kg, respectively. The LREE was dominant with the highest concentration of Ce. The distribution pattern of the REE contents in the teas and corresponding plantation soils were similar. Conclusion After the chondrite-nomalized distribution treatment, it was found that the REEs in the Fujian teas had a similar pattern with those of the soils in the Fujian province and China's Mainland, and also with those in the green tea from Jiangsu province. However, the high concentrations of REEs in some Fujian teas should be paid with more attention and investigation.