钌催化高碘酸钾氧化丽春红G动力学光度法测定微量钌  

Kinetic spectrophotometric determination of ruthenium with its catalytic effects on oxidation of ponceau G by KIO_4

作　　者：侯能邦[1] 李祖碧[2] 陈吉书[1] 

机构地区：[1]云南曲靖师范学院化学系,曲靖655000 [2]云南大学成人教育学院,昆明650091

出　　处：《分析试验室》2002年第2期60-62,共3页Chinese Journal of Analysis Laboratory

摘　　要：在硫酸介质和热水浴中 ,Ru(Ⅲ )催化高碘酸钾氧化丽春红G(间 二甲苯 4,1 偶氮 2 萘酚 3 ,6 二磺酸基钠盐 )褪色 ,由此建立了测定痕量钌的新催化光度法。钌的质量浓度在 0～ 0 0 1 2 μg/mL范围内符合比尔定律 ,线性回归方程为lg(A0 /A) =- 0 0 2 798+45 7871c(μg/mL) ,r=0 9977。对 0 0 1 μg/mLRu(Ⅲ )测定的相对标准偏差为 2 5 % (n =1 1 )。催化反应的表观活化能为 5 8 5 5kJ/mol。催化反应对丽春红G和钌 (Ⅲ )分别为一级反应。试验了 40多种共存离子的影响。该方法已用于岩矿和冶金产品中痕量钌的测定 ,相对标准偏差为 1 2 %～2 2 % ,标准加入回收率为 96 0 %～ 1 0 6 1 %。In the H_2SO_4 medium and hot-water bath(90±0.5℃), Ru(Ⅲ) could catalyze oxidation of ponceau G by KIO_4. Based on this, a new kinetic method for spectrophotometric determination of Ru(Ⅲ) was developed. The linear range for the determination of Ru(Ⅲ) was 0～0.3 μg/25 mL with a linear regression equation of log( A_0/A )=-0.02798+45.7871 c (μg/25 mL)( r =0.9977). The relative standard deviation for 11 replicate determinations of 0.25 μg/25 mL of Ru(Ⅲ) was 2.5%. The apparent activation energy of this catalytic reaction was found to be 58.55 kJ/mol and the catalytic reaction was first-order for both Ru(Ⅲ) and ponceau G. The method was successfully applied to the determination of trace amounts of ruthenium in some ore and metallurgy products.

关 键 词：测定 钌 丽春红G 高碘酸钾 催化光度法 微量分析 催化氧化 

分 类 号：O614.821[理学—无机化学] O657.32[理学—化学]