中文摘要：

为了掌握陕南茶叶中稀土元素含量和分布状况,并利用稀土元素对茶叶产地进行判别,采用ICP-MS法对陕南地区44个茶叶样品中16种稀土元素进行了测定。结果表明：茶叶中不同稀土元素含量差异较大,其中La,Ce,Nd含量较高,平均含量分别为124.81,172.13,87.20μg·kg-1;茶叶样品中稀土氧化物含量范围为200.32-1558.35μg·kg-1,总体上呈东高西低趋势,且均低于国家规定限量;茶叶中稀土元素随地域变化表现出不同分布特征,但具有相似的丰度模式;利用主成分分析将茶叶稀土元素归结为轻稀土组和重稀土组,间接地证明轻稀土元素和重稀土元素在从土壤到茶叶迁移过程中仍存在着差异;聚类分析结果表明,稀土元素可作为陕南茶叶产地判别的重要指标。

英文摘要：

The inductively coupled plasma mass spectrometry （ICP-MS） was employed for the determination of 16 rare earth elements in 44 tea samples collected from different regions in south Shaanxi province in order to evaluate their contents and the relatives of the contents with their origin characteristics. The results showed that the contents of the rare earth elements differed significantly in tea samples. The contents of the elements La, Ce, and Nd were 124.81, 172.13, and 87.20 μg·kg-1 respectively, which were higher than the other elements. The contents of the rare earth oxides ranged from 200.32 to 1558.35 μg·kg-1 in the tea samples with the tendency of higher contents from west to east in the survey region, which were all below the limit of tea standards in China. The content distri- bution of the rare earth elements in tea presented significant differences with the regions, and showed similar abun- dance curve. Principal component analysis showed the rare earth elements were divided into light rare earth group and heavy rare earth group, which proved indirecdy there were differences from soil to tea between light rare earth elements and heavy rare earth elements. The cluster analysis results indicated that the contents of the rare earth ele- ments in the tea samples were important indexes for the identification of their origin characteristics.