离子选择性电极法测定两种茶饮料中的氟含量

Determination of Fluorine Content in Two Kinds of Tea Beverages by Ion Selective Electrode Method

使用氟离子选择性电极测定两种茶饮料中的氟,通过加入TISAB缓冲溶液控制测定条件,采用标准曲线法测定了＂康师傅＂绿茶和红茶中的氟含量。进行了回收率的测定,并对搅拌状态、有无TISAB以及溶液p H大小的影响进行了实验分析。结果表明,红茶中的氟含量为0.9602mg/L,加标回收率为95.79%~102.88%;绿茶中的氟含量为1.135mg/L,加标回收率为97.04%~101.06%。实验操作简单方便,回收率高,能满足对茶饮品的测定。

Determination of two kinds of tea beverage of fluoride in this experiment using a fluoride ion selective electrode, by adding TISAB buffer solution to control the determination conditions, using the standard curve method for the determination of the ＂Kangshifu＂ green tea and black tea in the fluorine content. Experiments were conducted to determine rate of recovery, And the mixing state, TISAB and pH solution has no effect on the size of the experimental analysis. The results show that, the fluorine content in black tea was 0.9602 mg/L, the recovery is 95.79%--102.88%; fluorine content in green tea is 1.135mg/L, the recovery is 97.04%~101.06%. The experiment of simple and convenient operation, high recovery rate, can satisfy the determination of tea drinks.