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以氟化镧单晶为敏感膜的氟离子选择电极,由于操作简便、干扰离子少,可在许多方面用于氟的定量分析。此法在有机氟元素微量分析中也已被应用。我们采用玻璃燃烧瓶分解样品,以柠檬酸钠为吸收液,用氟离子选择电极测定有机物中氟的含量,用格氏作图法处理数据,得到了较好的结果。实验部分(一)仪器与试剂 1.DD-2型电极电位仪(江苏泰县无线电厂)。 2.氟离子选择电极:CSB-F-1型氟化镧
Fluoride ion selective electrode with single crystal of lanthanum fluoride as sensitive membrane can be used for quantitative analysis of fluorine in many aspects because of its simple operation and less interference ions. This method has also been applied to trace elements in organic fluorine. We use the glass flasks to decompose the sample, take sodium citrate as the absorption liquid, measure the content of fluorine in the organic matter by the fluoride ion selective electrode, and get the good result by using the data of the Grignard graphing. Experimental part (a) instruments and reagents 1.DD-2 electrode potentiometer (Jiangsu Taixian Radio Factory). 2. Fluoride ion selective electrode: CSB-F-1 lanthanum fluoride