云南省普洱市茶叶中轻稀土元素含量调查  

Analysis on the Contents of Light Rare Earth Elements in Different Types of Tea from Yunnan Pu'er

作　　者：肖涵[1] 冯雷 李烨[3] 

机构地区：[1]昆明学院化学科学与技术系,云南昆明650214 [2]云南省产品质量监督检验研究院,云南昆明650223 [3]北京市环境保护科学研究院国家城市环境污染控制工程技术研究中心,北京100037

出　　处：《昆明学院学报》2015年第6期44-48,共5页Journal of Kunming University

基　　金：云南省科技厅应用基础研究资助项目(2013FZ102)

摘　　要：应用ICP-MS法对产自云南省普洱市的43种茶叶样品(绿茶17种、红茶5种、普洱生茶9种及普洱熟茶12种)中轻稀土元素(LREEs)含量进行分析.结果表明,23.26%的样品中稀土元素含量不符合国家食品安全标准,其中以普洱熟茶居多.各LREE含量差异明显,其含量高低顺序为:Ce>La>Nd>Pr>Sm>Eu,符合稀土元素(REE)排序规律的奥多-哈金斯法则.不同种类茶叶中LREEs质量分数差异大,呈现普洱熟茶>普洱生茶>红茶>绿茶的现象,可能与茶叶原料的生长成熟度有关.不同种类茶叶与LREEs及REO的显著性差异表明,LREEs可能是区别普洱茶与绿茶、红茶加工工艺的典型敏感性响应对象.茶叶中各LREEs质量分数相关性强,表明LREEs在样品中分馏情况趋于一致,其中Eu分馏效应较为明显.ICP-MS was used to determine light Rare earth elements (LREEs)in 43 tea samples from Pu′er area (1 7 green tea,5 black tea,9 Pu'er raw tea and 1 2 Pu′er fermented tea).The results showed that 23.26% of samples were unqualified because of high level of LREEs (mostly Pu′er fermented tea),compared with the national standard.Each content of LREEs showed significant difference.The trend of content values showed in sequence from Ce >La >Nd >Pr >Sm >Eu,which could be in accord with the Huggins Oddo rule. Contents of LREEs in different tea types showed difference with the variation tendency showed as Pu′er fermented tea >Pu′er raw tea >black Tea >green Tea.The reason of variation might be related to the maturity of fresh tea leaves.LREEs and REO showed significant difference between different kinds of tea,which indicated that LREEs might be a sensitive factor to distinguish different processing tech-nology between Pu′er tea and green tea and black tea.In addition,the content of LREES showed strong relevance which indicated LREES could show consistent fractionation trends in those samples,and Eu showed most effective fractionation.

关 键 词：普洱市 茶叶 轻稀土元素(LREE) ICP-MS 

分 类 号：TS272.7[农业科学—茶叶生产加工]