锰对溴酸钾氧化罗丹明B的荧光猝灭效应研究及其应用  

Study on the fluorescence quenching effect of manganese on the oxidization of rhodamine B by potassium bromate and its applicaiton

作　　者：崔英[1] 吕建晓[1] 

机构地区：[1]河南科技学院资源与环境学院,河南新乡453003

出　　处：《冶金分析》2016年第1期75-78,共4页Metallurgical Analysis

摘　　要：在酸性条件下，溴酸钾氧化罗丹明B发生荧光反应，锰（Ⅱ）能催化该荧光猝灭反应。实验研究了锰对溴酸钾氧化罗丹明B的荧光猝灭效应并讨论了将其应用于锰分析的最佳条件。试验表明，在50mL比色管中，分别依次加入3．5mL1．0×10^-6mol／L罗丹明B溶液、1．5mL1．0×10^-4mol／L溴酸钾溶液、1．2mL0．1mol／L盐酸及不同量的锰（Ⅱ）溶液，于60℃加热8min，锰（Ⅱ）质量浓度在1．0×10^-8～2．0×10^-7mol／L范围内与荧光猝灭程度呈线性响应，方法的检出限为2．0×10^-9mol／L。体系应用于水样中锰的分析，测得结果与原子吸收光谱法基本一致，相对标准偏差（RSD，n=11）为3．9％～4．20A。The rhodamine B was oxidized by potassium bromate in acid conditions to generate fluorescence quenching reaction, which could be catalyzed by manganese（Ⅱ）. The fluorescence quenching effect of man- ganese on the oxidization of rhodamine B by potassium bromate was studied. The optimal conditions for the determination of manganese were investigated. In 50 mL colorimetrie tube ,3.5 mL of 1.0×10^-6 mol/ L rhodamine B solution, 1.5 mL of 1.0×10^- 4 mol/L potassium bromate solution,1.2 mL of 0. 1 mol/L hydrochloric acid and manganese（Ⅱ） solution with different amounts were added in sequence. After heating at 60 ℃ for 8 min, the content of manganese was determined. The results showed that the mass concentra- tion of manganese（Ⅱ） in range of 1.0×10^-8-2.0 ×10^-7 mol/L was linear to the fluorescence quenching ex- tent. The detection limit was 2.0×10^-9 mol/L. The proposed method was applied to the determination of manganese in water sample. The found results were consistent with those obtained by atomic absorption spectrometry. The relative standard deviations （RSD, n=11） were between 3.9% and 4.2%.

关 键 词：溴酸钾 罗丹明B 荧光猝灭 水 锰 

分 类 号：O657.3[理学—分析化学]