天青Ⅱ-高碘酸钾系统催化动力学光度法测定痕量铑(Ⅲ)  

Catalytic kinetic spectrophotometry determination of trace Rhodium with Rh(Ⅲ)-KIO_4-AzureⅡ system

作　　者：王洪福[1] 苏智先[2] 张素兰[2] 何黎明[1] 

机构地区：[1]绵阳师范学院化学与化学工程学院,四川绵阳621000 [2]绵阳师范学院生命科学与技术学院,四川绵阳621000

出　　处：《化学研究与应用》2010年第6期731-734,共4页Chemical Research and Application

摘　　要：Under the condition of 100 ℃ and hydrochloric acid as medium,the depigmentation reaction of potassium periodate oxidizing AzureⅡcan be greatly catalyzed by rhodium(III).A new catalytic kinetic analyzing method was established based on that.The optimal experimental condition of the reaction was discussed.The absorbency difference △A remained good linear relationship with the mass concentration of rhodium(III)in the range of 0.004-0.060 μg·mL-1,and the detection limit was 1.09×10-10 g·mL.The relative standard deviation RSD was 1.15%(n=13).The dynamic parameter was also determined and the reaction a first order reaction to rhodium(III) and the total reaction was pseudo first order reaction.The apparent rate constant was 1.09×10-3s-1,and the apparent activation energy was 76.07 kJ·mol-1.It was applied to the determination of rhodium(III) in sample molecular sieve and active carbon with the recovery rate between 103.6-105.2 % that met the request of trace analysis.Under the condition of 100 ℃ and hydrochloric acid as medium,the depigmentation reaction of potassium periodate oxidizing AzureⅡcan be greatly catalyzed by rhodium（III）.A new catalytic kinetic analyzing method was established based on that.The optimal experimental condition of the reaction was discussed.The absorbency difference △A remained good linear relationship with the mass concentration of rhodium（III）in the range of 0.004-0.060 μg·mL-1,and the detection limit was 1.09×10-10 g·mL.The relative standard deviation RSD was 1.15%（n=13）.The dynamic parameter was also determined and the reaction a first order reaction to rhodium（III） and the total reaction was pseudo first order reaction.The apparent rate constant was 1.09×10-3s-1,and the apparent activation energy was 76.07 kJ·mol-1.It was applied to the determination of rhodium（III） in sample molecular sieve and active carbon with the recovery rate between 103.6-105.2 % that met the request of trace analysis.

关 键 词：铑(Ⅲ) 高碘酸钾 天青Ⅱ 催化动力学光度法 分子筛 活性炭 

分 类 号：O657.32[理学—分析化学]