【摘要】 拟定了一个动力学荧光测定柠檬酸的新方法，在硫酸介质中，柠檬酸能活化钒（Ⅴ）催化氯酸钾氧化罗丹明 ６Ｇ，使其荧光猝灭，方法检出限为 １．３ × １０－６ｍｏｌ／Ｌ；线性范围为 ４．０×１０－６～１．２×１０－４ｍｏｌ／Ｌ。直接用于柠檬酸钠注射液、汽水中柠檬酸的测定。回收率为 ９６％～１００.５％，获得满意结果；更多还原

【Abstract】 A kinetic-fluorimetric method is proposed for the determination of citric acid. The method is based on the activation effect of citric acid on oxidation of rhodamine 6G by KClO3 in the presence of vanadium (Ⅴ), which acts as a catalyst in the solution of sulfuric acid. The detection limit for citric acid is 1. 3 X 10-6 mol/L, the linear range of determination is 4. 0 X 10-6~ 1. 2 X 10-4 mol/L. The method has been used to determine citric acid in injection of sodium citrate and aerated water with satisfactory results.更多还原