二溴硝基偶氮氯膦催化动力学光度法测定微量铂(Ⅳ)、铑(Ⅲ)的研究  

Catalytic Spectrophotometric Determination of Trace Platinum and Rhodium with Periodate-dibromo-nitro-chlorophsphonazo System

作　　者：刘锡林[1] 李琼[1] 张宏[1] 王斌[1] 

机构地区：[1]甘肃联合大学理工学院,甘肃兰州730010

出　　处：《甘肃联合大学学报（自然科学版）》2005年第4期38-40,共3页Journal of Gansu Lianhe University :Natural Sciences

摘　　要：在H2SO4介质中, 微量铂(Ⅳ)、铑(Ⅲ)的存在对溴酸钾氧化二溴硝基偶氮氯膦的褪色反应有明显的催化作用.该文研究了二溴硝基偶氮氯膦催化动力学光度法测定微量铂、铑的最佳条件及测定方法. 铂、铑的检出限分别为0.005μg·mL-1和0.002μg·mL-1,其含量在0.005～0.050μg·mL-1范围内线性关系良好. 铂-铑催化剂中铂、铑含量可同时测定.A Spectrophotometric method has been deveioped for the determination of Trace Platinum and Rhodium,based on their catalytic effect on potassium bromate oxidation of periodate-dibromo-nitro-chlorophsphonazo system in H2SO4 medium. The optimum conditions of the fading reaction have been determined. The determination limits of Pt and Rh was respectively 0. 005μg·mL^-1 and 0. 002 μg·mL^-1 and the linear range was 0. 005-0. 050pμg·mL^-1 . The content of Pt and Rh in Pt-Rh catalytic can be determined.

关 键 词：二溴硝基偶氮氯膦 铂 铑 溴酸钾 催化分光光度法 

分 类 号：O657.32[理学—分析化学]