摘要
目的 研究砖茶和绿茶中稀土含量以及饮茶地区居民饮茶摄入的稀土暴露水平。方法 用微波消解-电感耦合等离子体质谱法测定砖茶和绿茶中稀土含量,采用点评估方法计算暴露水平。结果 砖茶中稀土含量为4.09~8.01 mg/kg,绿茶中稀土含量为0.53~1.42 mg/kg,砖茶中稀土含量远高于绿茶。鄂东南地区砖茶和绿茶中稀土元素主要为Ce、La、Nd、Y和Sc 5种,在砖茶和绿茶中这5种稀土元素含量之和占稀土总量的比例分别为82.60%（4.51/5.46）和88.12%（0.89/1.01）。结论 饮用绿茶的稀土平均暴露量和最大暴露量分别为0.05和0.17μg/kg BW,饮用砖茶的稀土平均暴露量和最大暴露量分别为0.27和0.91μg/kg BW,均小于目前提出的稀土每日允许摄入量（ADI）值。
Objective This study aims to investigate the rare earth elements （REEs） levels in brick tea and green tea, and estimate the intakes of REEs to the tea consumption population. Methods Altogether 30 tea samples were collected from southeast of Hubei Province. REEs in brick tea and green tea were detected by microwave digestion and inductively coupled plasma mass spectrometry. Results The concentration of REEs in brick tea and green tea were 4.09-8.01 and 0. 53-1.42 mg/kg, respectively, and the content of REEs in the brick tea which were made by older tea leaves was significantly higher than green tea. Ce, La, Nd, Y and Sc were the main elements among 16 REEs, all together accounting for 82.60% （4. 51/5.46） in brick tea and 88. 12% （0. 89/1.01 ） in green tea. Conclusion In the average exposure level, the exposure of REEs from green tea and brick tea were 0.05 and 0.27μg/kg BW. In the high exposure level, the exposure of REEs from green tea and brick tea were 0. 17 and 0. 91 μg/kg BW. All the exposure were less than the current advised ADI values.
出处
《中国食品卫生杂志》
2015年第6期683-686,共4页
Chinese Journal of Food Hygiene
基金
湖北省卫生厅青年科技人才项目(QJX2010-36)
关键词
茶
砖茶
绿茶
稀土
暴露评估
含量
湖北
食品污染物
Tea
brick tea
green tea
rare earth
exposure assessment
content
Hubei
food contaminant
