不同稀土含量水平茶叶中稀土浸出率研究  

Study on Rare-Earth Oxides Leaching Rate of Tea Samples Differed by Content Levels

作　　者：杨秀芳[1] 孔俊豪[1] 赵玉香[1] 陈水潮 

机构地区：[1]中华全国供销合作总社杭州茶叶研究院,浙江杭州310016 [2]安溪铁观音研究院,福建安溪362400

出　　处：《中国茶叶加工》2012年第1期14-17,共4页China Tea Processing

基　　金："十二五"农村领域国家科技支撑计划课题"茶叶质量安全控制关键技术研究与示范"(2011BAD01B02-1)

摘　　要：选取不同稀土含量水平(不超标、中度超标、严重超标)的三种典型茶叶样品开展稀土浸出率实验和浸出安全性研究,采用间接定量法系统考察了茶叶在不同浸提条件下稀土元素的溶出率,并对茶汤中稀土的摄食安全性进行了评价预测。结果表明:受试茶样在不同浸出条件下,稀土元素(以氧化物总量计)的总浸出率均在20%以内,依据ADI参考值,仍处于低暴露水平,因此,稀土含量水平适度偏高的茶样在泡饮过程中尚不足以引起膳食安全性问题。Typical tea samples representing current levels（under the standard scope, moderate and beyond the standard greatly）of rare earth elements in tea were picked out to carry out experiments of leaching and security studies, and indirect quantitative method was used to calculate the leaching rates and dissolution of rare earth oxides accurately under different infusing conditions including brewing, the security of rare earth oxides in the tea brew was evaluated on dietary risk accordingly. Results of all previous showed that dissolved rare earth oxides （REOs） in test samples digesting in the brew were less than 20% of the total REOs. According to ADI reference value, the above limited leaching rates of REOs were at a low level of exposure,so it could be said that REOs in tea by given an appropriate higher level could not cause safety issue on dietary reliability during tea brewing process.

关 键 词：茶叶 稀土超标 浸出率 安全性 

分 类 号：TS272.7[农业科学—茶叶生产加工]