摘要
在H2SO4溶液中，Fe^3＋与过量KI反应后生成I3ˉ阴离子，I3ˉ与罗丹明6G形成离子缔合物，并使罗丹明6G发生荧光猝灭，据此建立了测定Fe^3＋的荧光猝灭分析方法。方法的线性范围为20～200μg/L，检出限为8．3μg/L，用于中草药中铁的测定。
A fluorescence quenching method was developed for the determination of iron（Ⅲ ） with rhodamine 6G as a fluorescent reagent, Iron（Ⅲ） reacted with potassi.um iodide in dilute sulfuric acid solution to produce I3- anion which can react with rhodamine 6G to form a non-fluorescence compound to quench the fluorescence intensity of the system. The fluorescence intensity decreased linearly with the iron（Ⅲ ） concentration in the range of 20 to 200μg/L. The detection limit was 8.3 μg/L. It has been applied to the determination of iron（Ⅲ ） in the Chinese herbal medicine with satisfactory results.
出处
《分析试验室》
CAS
CSCD
北大核心
2008年第7期109-111,共3页
Chinese Journal of Analysis Laboratory
基金
广西大学科研基金(校基金项目编号:X051108)资助项目
