氟离子选择性电极测定菏泽市番茄汁中的氟氟离子选择性电极测定菏泽市番茄汁中的氟.doc

PAGE  PAGE 7 目录 摘要…………………………………………………………………………………………………1 关键词………………………………………………………………………………………………1 Abstract ……………………………………………………………………………………………1 Key words …………………………………………………………………………………………2 引言…………………………………………………………………………………………………2 1 实验部分 ……………………………………………………………………………………2 1.1 实验原料及仪器设备 ……………………………………………………………………2 1.1.1 原料与试剂………………………………………………………………………………2 1.1.2 仪器与设备………………………………………………………………………………2 1.2 实验原理 ……………………………………………………………………………………2 1.3 实验准备 ……………………………………………………………………………………2 1.3.1 采样 ………………………………………………………………………………………2 1.3.2 番茄汁的制备……………………………………………………………………………2 1.4 测定步骤 ……………………………………………………………………………………2 2 数据记录及分析 …………………………………………………………………………3 2.1 数据记录 ……………………………………………………………………………………3 2.2 数据分析 ……………………………………………………………………………………4 3 结果与讨论…………………………………………………………………………………6 4 结论……………………………………………………………………………………………6 参考文献……………………………………………………………………………………………6 致谢…………………………………………………………………………………………………6 氟离子选择性电极测定菏泽市番茄汁中的氟 化学专业 王延平 指导老师 闫循智 摘要：菏泽市属高氟区地域环境。为探究菏泽市番茄汁的含氟量，用氟离子选择电极，分别测定牡丹区、东明县、定陶县番茄汁的电位值。根据电位值与氟离子浓度的线性关系求番茄汁的含氟量。测量溶液的酸度为pH=5～6，用总离子强度调节缓冲液（TISAB）消除干扰离子及酸度的影响。结果显示线性范围为1.0×10-4mol.L-1～4.26×10-6mol.L-，方法回收率96.12%～92.24%，最低检出浓度0.038ug.ml-1。表明番茄汁的含氟量符合检测标准，人体摄入番茄汁不会有氟危害。 关键词： 氟离子选择性电极； 番茄汁； 酸度； 氟 Determination on Fluoride in tomato juice growing in Heze by fluoride ion selective electrode Student majoring in chemistry ?????????? ??Wang Yanping Tutor????????????????????? ???????? ??????? Yan Xunzhi Abstract: The geographical environment of Heze belongs to higher fluorine content area. In order to explore fluorine-containing volume of tomato juice growing in Heze, the potential value of tomato juice growing in Mudan district, Dongming County and Dingtao County was determined by using fluoride ion selective electrode according to the linear relationship between potential value and the concentration of fluoride ion. The solution acidity was pH = 5 ~ 6. The buffer solution ( TISAB) was adjusted by controlling the total ionic stren