不同产区及季节铁观音中稀土元素的组成特征研究

摘要

目的：研究安溪铁观音中稀土元素的组成特征,探索不同产区及季节对铁观音中稀土元素组成的影响。方法采用电感耦合等离子体质谱仪(inductively coupled plasma-mass spectrometry, ICP-MS)对安溪铁观音6个主产区—桃舟乡、祥华乡、大坪乡、虎邱镇、感德镇和西坪镇所产茶叶中的16种稀土元素的含量进行测定,对不同样品中的稀土元素的含量和组成进行分析。结果安溪铁观音中稀土元素含量的检出范围为0.68~15.94 mg/kg,含量平均值为2.64 mg/kg,含量中值为1.73 mg/kg,轻稀土元素与重稀土元素含量的比值为2.4,轻稀土元素含量占稀土元素总量的67.0%~74.4%。样品中稀土元素的含量从高到低依次为：Ce, La, Y, Nd,其他稀土元素。春季和秋季铁观音中稀土元素的含量间无明显差异。结论安溪县不同产区铁观音中稀土元素的总量从高到低依次为：感德镇、虎邱镇、桃舟乡、大坪乡、祥华乡和西坪镇,季节并不影响茶叶对于稀土元素的总富集能力。%Objective To study the composition characteristics of rare earth elements (REEs) in Tie Guanyin from Anxi prefecture, and investigate the effects of different areas and seasons on the REEs composition of Tie Guanyin. Methods Inductively coupled plasma-mass spectrometry (ICP-MS) was used for the determination of 16 kinds of REEs in Tie Guanyin which sampled from 6 major tea-producing regions of Anxi prefecture-Taozhou country, Xianghua country, Daping country, Huqiu town, Gande town and Xiping town. Results The content of REEs in Tie Guanyin from Anxi prefecture were in the range of 0.68~15.94 mg/kg, and the average and median of the content were 2.64 mg/kg and 1.73 mg/kg, respectively. The ratio of light rare earths to heavy rare earths was 2.4. The ratios of light rare earths of the total REEs were 67.0%~74.4%. The order of REEs content was:Ce>La>Y>Nd>other REEs. The content of the total REEs in samples from spring and autumn showed no significant difference. Conclusion The content of the total REEs in Tie Guanyin from different areas of Anxi prefecture arranged from high to low as:Gande Town, Huqiu town, Taozhou country, Daping country, Xianghua country and Xiping Town. The season does not affect the total concentration of REEs in tea.