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摘要：果汁饮料营养丰富，含有多种矿物质元素，但其种类和含量相差较大。为了分析和评价市售果汁饮料中矿物元素的含量和分布，本研究采用石墨炉原子吸收分光光度法测定了19种纯果汁的含量，测定了铜、镉、铅、硒、锌、铁的含量，并对其安全性进行了初步评价。实验结果表明：纯果汁中铜、锌、硒的含量非常少，铜的平均含量为1.3462μg/L、镉的平均含量为24.5388μg/L、铅的平均含量为107.3125μg/L、硒的平均含量为161.4325μg/L、锌的平均含量为10.7912μg/L、铁的平均含量为84.9684μg/L均在安全范围内。本实验结论可为市售果汁的选择和饮用提供参考。43673
毕业论文关键词：果汁；原子吸收光谱法；矿物元素；分析
Analysis and evaluation of mineral elements in fruit juice
Abstract: Juice drinks rich nutrition, contain a variety of mineral elements, but the type and content of large difference. I mainly analysis and evaluation of the experiment, the content and distribution of mineral elements in selling fruit juice drinks, this research adopted the graphite furnace atomic absorption spectroscopy has been determine the content of the 19 kinds of fruit juice, the determination of copper, iron, lead, zinc, selenium, cadmium content, and its security has carried on the preliminary evaluation. The experimental results showed that the copper, zinc, selenium content in fruit juice is very little, copper content to an average of 1.3462μg/L, cadmium content to an average of 24.5388μg/L, Lead content to an average of 107.3125μg/L, selenium content to an average of 161.4325μg/L, zinc content to an average of 10.7912μg/L, iron content to an average of 84.9684μg/L are in the range of security. This experiment resulted can provide reference for the choice of commercial fruit juice and drink.
Key words: Fruit juice; atomic absorption spectroscopy; mineral elements; analysis
目录
1引言 1
1.1 纯果汁的概述 1
1.2 果汁的分类 1
1.3 铜 2
1.4 镉 2
1.5 铅 2
1.6 硒 3
1.7 锌 3
1.8 铁 3
1.9 矿物质元素污染的来源 3
1.9.1 矿物元素的分析方法 4
1.10 本课题研究的目的与意义 5
2 材料与方法 6
2.1 实验材料 6
2.2 实验仪器及设备： 6
2.3 实验方法 6
2.3.1 实验样品制备 6
2.3.2 标准曲线的制作 6
2.3.3 样品测定 6
2.3.4 果汁中金属含量测试方法 6
3 结果与分析 8
3.1 果汁中铜元素的分析及评价 8
3.2 果汁中镉元素的分析及评价 10
3.3果汁中铅元素的分析及评价 12
3.4 果汁中硒元素的分析及评价 14
3.5 果汁中锌元素的分析及评价