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罗丹明6G缔合微粒荧光猝灭法测定痕量碘酸根 |
Fluorescence Quenching Determination of Trace IO3- Based on Formation of Rhodaine 6G Association Particles |
投稿时间:2004-03-09 修订日期:2004-04-27 |
DOI: |
中文关键词: IO3- 罗丹明6G 缔合微粒 荧光猝灭 共振散射 |
英文关键词:IO3- Rhodamine 6G association particle fluorescence quenching resonance scattering |
基金项目:广西自然科学基金;广西师范大学博士科研启动基金资助项目。 |
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中文摘要: |
研究发现在0.01mol/LHCl-8.0×10-4mol/LKI介质中,罗丹明6G(RhG)在550nm处有1个荧光峰.当有IO3-,I3-与RhG形成缔合微粒,550nm处荧光峰猝灭,在320、400、6103存在时,IO3-与过量的I-反应生成I-nm处有3个共振散射峰,在470nm处有1个同步散射峰.碘酸根浓度在2.0~100×10-7mol/L范围内与荧光猝灭强度成线性关系.据此建立了一个测定食盐中IO3-的荧光猝灭分析法.光谱研究结果表明,(RhG-I3)n缔合微粒和界面的形成是导致体系荧光猝灭的根本原因. |
英文摘要: |
Under the conditions of 0.01 mol/L HCl-8.0 10-4 mol/L KI, there is a fluorescence peak at 550 nm for Rhodamine 6G (RhG). When there is IO3-, it reacts with I- to form I3-. RhG and I3- combine an ion association particle. The particles exhibit three resonance scattering peaks at 320, 400 and 610 nm and a synchronous scattering peak at 470 nm. And there is fluorescence quenching at 550 nm. IO3- concentration in the range of 2.0 to 100×10-7 mol/L is proportional to the fluorescence quenching intensity at 550 nm. A new fluorescence quenching method has been described for the determination of IO3- in salt samples. The spectral results have been verified that the formation of (RhG-I3)n association particles and the interface is main factor that cause the fluorescence quenching effects. |
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