【摘要】 催化动力学光度法测定超痕量银的研究张志琪，陈世荣，陈党教，张根绪（陕西师范大学化学系，西安，７１００６２）关键词银，罗丹明Ｂ，催化褪色反应，动力学分析法，催化光度法在催化动力学分析法研究领域，新的高灵敏度的指示反应的研究具有重要的现实意义［１］。前文...更多还原

【Abstract】 In the presence of α,α’-bipyridyl as activator, the reaction between rhodamine B and potassium peroxydisulphate can be catalyzed by silver(Ⅰ) in acetic acid buffer solution (pH 4. 9) with the result of decoloration of rhodamine B. The catalytic reaction is pseudo-zero-order in reactant and the apparent activation energy of catalytic reaction is found to be 37.66kJ/mol.A new catalytic spectrophotometry for determination of ultra-trace silver has been developed. The range of determination is 0.38-35 ng/25 mL silver and the precision is 3.8%obtained from 11 standard solutions each of which contains 20 ng silver. The method has been applied to the determination of trace silver in ores.更多还原