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.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2000年第1期31-34,共4页
Chinese Journal of Analytical Chemistry
关键词
钌
耐尔蓝
高碘酸盐
催化光度法
Ruthenium, Nile Blue, periodate, catalytic spectrophotometry
