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实验发现,在HAc介质中,痕量F~-对Fe~(3+)催化的还原型罗丹明B(RRB)被H_2O_2氧化生成红色产物的反应,有一定的阻化作用。40℃时,固定反应时间10min,不加F~-与加F~-反应产物的吸光度之差值与F~-的浓度呈正比关系。用正交设计优化方法优化实验条件,并用计算机进行数据处理,从而确定了一个新的测定痕量F~-的动力学光度分析方法。方法的灵敏度为1.22×10~(-9)g/ml,线性范围为0.036～0.286μg.ml.用于水样分析,结果与F~-离子选择性电极法所得结果相接近。
It was found that the trace amount of F ~ - had some resistance to the oxidation of Fe 3+ -reducing rhodamine B (RRB) to H 2 O 2 in the HAc medium. 40 ℃, the fixed reaction time 10min, without F ~ - plus F ~ - absorbance of the reaction product of the difference between the concentration and F ~ - concentration was in direct proportion. Using orthogonal design optimization method to optimize the experimental conditions, and computer data processing, to determine a new method for the determination of trace F ~ - kinetic spectrophotometry. The sensitivity of the method was 1.22 × 10 -9 g / ml, and the linear range was 0.036 ~ 0.286 μg.ml. For the water sample analysis, the results were close to those obtained by the F ~ - ion selective electrode method.