二安替比林间溴苯基甲烷-高碘酸钾体系动力学光度法测定钌

Determination of Ruthenium in Ruthenium(Ⅲ) Diantipyryl ( m bromo) phenylmethane Potassium Periodate System by Kinetic Spectrophotometry

在Ｈ３ＰＯ４ 介质中，Ｒｕ（ Ⅲ） 对ＫＩＯ４ 氧化二安替比林间溴苯基甲烷（ ＤＡｍ ＢＭ） 的显色反应有明显的催化作用。基于此，建立了测定痕量钌的催化分光光度分析法，并且测定了一些动力学参数。方法的检出限为２ ．３ μｇ／ Ｌ，钌的质量浓度在０ ～１２ μｇ／ Ｌ 符合比尔定律。方法已应用于矿样中痕量钌的测定，５ 次测定的ＲＳＤ＜ ５ ％ ，加标回收率在９６ ％ ～１０１ ％ 。

A kinetic spectrophotometric method for the determination of ruthenium (Ⅲ) based on the catalytic effect of Ru on the oxidative color reaction of diantipyryl ( m bromo) phenylmethane with potassium periodate in phosphoric acid medium has been developed. The detection limit is 2.3 μg/L for Ru (Ⅲ)and Beers law is obeyed in the concentration range of 0～12 μg/L. Some kinetic parameters were also studied. The method has been applied to the determination of ruthenium in ores. The recoveries are 96%～101% for Ru(Ⅲ) with precision of <5% RSD( n =5).