耐尔蓝-高碘酸钾催化光度法测定痕量钌  

Catalytic Spectrophotometric Determination of Trace Ruthenium Based on the Oxidation of Nile Blue by Periodate

作　　者：李祖碧[1] 曹秋娥[2] 王加林[1] 徐其亨[2] 李立新[3] 

机构地区：[1]云南大学成人教育学院,昆明650091 [2]云南大学成人教育学院化学系,昆明650091 [3]昆明贵金属研究所,昆明650221

出　　处：《分析化学》2000年第1期31-34,共4页Chinese Journal of Analytical Chemistry

摘　　要：在磷酸介质和加热条件下，钌（Ⅲ）对高碘酸钾氧化耐尔蓝（ＮＢ）有强催化作用，详细研究了动力学条件，建立了动力学光度测定钌的新方法，１g（Ａ０／Ａ）与ＣＲu（Ⅲ）呈线性关系的范围为０．００８～１．２ｕｇ／Ｌ，检出限为０．００８ｒｇ／Ｌ，对０．００８和０．８ｕｇ／ＬＲｕ（Ⅲ）测定的ＲＳＤ分别为１４．３０％６和１．７３（n＝１１ ）。本催化反应对Ｒu（Ⅲ）、ＮＢ和ＫＩＯ４为一级反应，表观活化能为７３．A kinetic method for the determination of trace ruthenium based on its catalysis to the oxidation of Nile blue (NB) by periodat in the H_3PO_4 medium and hot water bath is established. The Linear relation betwen the log(Ao/A) and the concentration for Ru(Ⅲ ) is foun to be0.008~ 1 .2 μg/L, and the detection limit is 0.008 μ/L of Ru(Ⅲ ). The relative standard deviation for 11 replicate measurements of 0.008 and 0. 8 μg/ of Ru(Ⅲ ) is 14. 3% and 1. 7%, repectively. The catalytic reaction is first-order in Ru(Ⅲ ), NB and KIO_4 and the apparent activation energy of catalytic reaction is found to be 73 .43 kJ/mol. The reaction mechanium is also discussed. The interference over 40 foreign ions were tested. There was no interference form 13-fold amount of Os(Ⅷ ), 30-fold amount of Ir(Ⅳ ),60-fold amount amount of Au(Ⅲ ), Rh(Ⅲ ) and 400-fold of Pt(Ⅳ) and Pd(Ⅱ ). The method has been applied to the determination of trace ruthenium in some ores and metallurgical products with satisfactory result.

关 键 词：钌 耐尔蓝 高碘酸盐 催化光度法 

分 类 号：O657.3[理学—分析化学]