橙黄G催化动力学光度法测定痕量钌  

Kinetic spectrophotometric determination of trace ruthenium with orange G

作　　者：郭洁[1] 杨明惠[1] 杨志毅 李祖碧[2] 曹秋娥[2] 

机构地区：[1]大理学院生化系,大理671000 [2]云南大学化学系,昆明650091

出　　处：《分析试验室》2005年第2期38-40,共3页Chinese Journal of Analysis Laboratory

基　　金：大理学院科研基金项目(2002X04)

摘　　要：研究了钌(Ⅲ)催化KIO4氧化橙黄G(OG)褪色反应的反应条件,测定了该反应的反应级数和表现活化能,并建立了一个测定钌的新动力学光度法。在选定的实验条件下,非催化反应体系与催化反应体系在470nm波长处的吸光度差值与钌(Ⅲ)的质量浓度在0 50～6 0ng/mL范围内有良好的线性关系,检出限为4.4×10-8g/L。对2 0ng/mL钌(Ⅲ)测定11次的相对标准偏差为1 4%。方法可用于冶金产品及岩矿中痕量钌的测定。The reaction conditions and kinetic parameters including the reaction-order and apparent activation energy for the catalytic effect of ruthenium (Ⅲ) on the oxidation reactions of orange G by KIO_4 were investigated, and a new kinetic spectrophotometric method for the determinations of Ru(Ⅲ) was developed. Under the selected conditions, good linear relationship was obtained between the difference of the absorbance of the uncatalytic and calalytic systems at 470 nm and the concentration of Ru(Ⅲ) in the range of 5～150 ng/25 mL, the detection limit was 4.4×10^(-8) g/L. The relative standard deviation for 11 replicate determinations of 50 ng/25 mL of Ru(Ⅲ) was calculated to be 1.4%. The method is of good selectivity and high sensitivity, and it has been successfully applied to the determination of ruthenium in the metallurgy products and ore samples.

关 键 词：钌 KIO4 橙黄G 催化光度法 

分 类 号：O657.32[理学—分析化学]