罗丹明6G荧光猝灭法测定痕量次氯酸根  

Determination of Trace Hypochlorite with Rhodamine 6G by Fluorescence Quenching Method

作　　者：梁爱惠[1] 章表明[1] 

机构地区：[1]桂林工学院材料与化学工程系,广西桂林541004

出　　处：《桂林工学院学报》2008年第2期212-215,共4页Journal of Guilin University of Technology

基　　金：广西科学基金资助项目(桂科基0575042)

摘　　要：在稀盐酸介质中,ClO^-与过量的I^-反应生成I3^-,I3^-分别与罗丹明6G（RhG）、罗丹明S（RhS）、罗丹明B（RhB）及丁基罗丹明B（b-RhB）形成缔合微粒而导致各体系的荧光分别在550、550、580和580 nm处发生猝灭。ClO^-浓度分别在0.015～0.43、0.020～0.35、0.020～0.51、0.020～0.35 mg/L范围内与各体系的荧光猝灭强度具有线性关系。各体系的检出限分别为0.010、0.016、0.028和0.029 mg/L ClO^-。据此建立了测定次氯酸根的荧光猝灭分析法,其中RhG-ClO^--KI体系不仅灵敏度高而且稳定性较好,用于漂渍液和漂白粉中ClO^-的测定,结果满意。ClO^- oxidizes excess I^- to form I3^- in HCl medium.I3^- combines respectively with rhodamine 6G（RhG）,rhodamine S（RhS）,rhodamine B（RhB） and butyl-rhodamine B（b-RhB） to form association particles,exhibiting fluorescence quenching at 550,550,580 and 580 nm.The fluorescence quenching intensity for the RhG,RhS,RhB and b-RhB systems is proportional to ClO^-concentration within the range of 0.015～0.43,0.020～0.35,0.020～0.51 and 0.020～0.35 mg/L,and detection limit of 0.010,0.016,0.028 and 0.029 mg/L,respectively.The RhG system has high sensitivity and good stability.It is used for the determination of ClO^- in bleaching powder and liquid with satisfactory result.

关 键 词：ClO- 罗丹明6G 缔合微粒 荧光猝灭法 

分 类 号：O657.3[理学—分析化学]