罗丹明S-高碘酸钾体系催化光度法测定痕量铑  

Catalytic Spectrophotometry Determination of Trace Rhodium(Ⅲ) with Rhodamine S-KIO_4 System

作　　者：郑志勇[1] 郑振峰[1] 曾勤 张韬顺[1] 

机构地区：[1]漳州职业技术学院食品与生物工程系,福建漳州363000 [2]龙溪轴承股份有限公司,福建漳州363000

出　　处：《分析测试技术与仪器》2006年第3期188-190,共3页Analysis and Testing Technology and Instruments

摘　　要：研究了铑（Ⅲ）催化高碘酸钾氧化罗丹明S的褪色反应，据此建立了测定微量铑的催化光度分析法，研究了该催化氧化还原褪色反应的最佳条件及动力学参数，结果表明：在以硫酸为介质及90±0．5℃的条件下，罗丹明S-高碘酸钾体系测定微量铑的方法具有较高的灵敏度，线性范围为10～140μg／LRh（Ⅲ），检出限为5．0×10μg／mL，表观活化能为64．86kJ／mol，方法灵敏，准确，应用于合成样品中微量铑的测定，结果令人满意。Based on the catalytic effects of rhodium （Ⅲ） on the colour fading reactions of Rhodamine S by oxidizing with KIO4, a new catalytic speetrophotometrie method for the determination of rhodium（Ⅲ） has been developed. The optimum condition and kinetic parameters of this reaction was studied in detail. The results show that in sulphurie acid medium and at 90±0.5℃, the method has higher sensitivity, the linear range of the determination was 10～140μg/L, the detection limit was 5.0×10^-9 g/mL, and the apparent activation energy of catalytic reaction was 64. 86 kJ/mol. The method has been applied to the determination of Rhodium in its composite samples with satisfactory results.

关 键 词：罗丹明S 铑 高碘酸钾 催化光度法 

分 类 号：O657.7[理学—分析化学]