茶叶中稀土元素的分析研究+文献综述
毕业论文关键词： 稀土元素；茶叶；电感耦合等离子质谱仪；微波消解
Study on the rare earth elements in tea
Abstract: This study is mainly to the determination of trace rare earth elements in tea, analyze the results when the accuracy of the data is improved. in order to make the data become more accaurate and sure the reliability of the experimental data after , the study texts the standard tea sample again and again. after that ,the study measured many different kind tea samples what from different locations with the method which ensured before. the pretreatment of tea samples is used microwave digestion ,and used ICP-MS to measure the data. In the process of preliminary experiment, the results of some elements is lower than it used to be, the study made it out with changing experiment method and adjusting the standard curve, at last study gets a more perfect experiment process ,then measured all of the tea samples with the same way. according to the data , the trace rare earth elements in Oolong tea which is half fermentation tea is more than others tea kind.
Keywords: Rare earth elements ; Tea ; ICP-MS ; Microwave digestion
目录
1前言 1
1.1课题的意义与目地 1
1.2稀土元素的简介 1
1.2.1稀土元素的分类 2
1.2.2稀土元素在人体中的分布 2
1.2.3稀土元素对人体的不良影响 2
1.2.4稀土元素的药理作用 2
1.3茶叶的简介 3
1.3.1茶叶的发酵 3
1.3.2发酵茶 4
1.4微波湿化消解 4
1.4.1湿化消解 4
1.4.2微波消解 5
1.5电感耦合等离子体质谱 5
2实验部分 6
2.1实验用品 6
2.1.1实验设备 6
2.1.2实验试剂 6
2.1.3实验材料 7
2.2溶液的配置 7
2.2.1硝酸溶液的配置 7
2.2.2内标溶液的配置 7
2.3标准曲线溶液的制备 7
2.4检出限和定量限 8
2.5茶叶加标样品制备 8
2.6 样品前处理 8
2.6.1 样品研磨 8
2.6.2 微波消解 8
2.6.3 赶酸和定容 9
2.7样品的测定(ICPMS) 9
3实验结果与讨论 10
3.1数据的计算 10
3.1.1稀土元素含量计算： 10
3.1.2回收率的计算 10
3.1.3茶叶中稀土氧化物的计算 10
3.2分析方法确认数据 11
3.2.1 标准曲线 11
3.2.2检出限和定量限 16
3.2.3 茶叶加标样品的准确度和精密度 16