摘要
在磷酸介质及加热条件下 ,Ru(Ⅲ )对KIO4氧化二安替比林邻氯苯基甲烷(DAoCM)显色反应有强烈的催化作用 ,由此建立了测定痕量Ru的催化分光光度分析法 ,体系的非催化反应 (吸光度为Ao)和催化反应 (吸光度为A)的最大吸收波长均为 50 5nm ,Ru含量在 0 0～ 12 0 0ng/2 5ml范围内符合比尔定律 ,检测限为 2 0× 10 - 1 0 g/ml,反应的表观活化能为 75 3 3kJ/mol,反应表观速率常数为 4 77× 10 - 4/s,方法用于矿样中痕量Ru的测定 ,结果满意。
In phosphoric acid medium and heat water bath,a kinetic spectrophotometric method has been established for the determination of trace ruthenium based on its catalytic effect on the oxidative colour reaction of potassium periodate with diantipyryl-(o-chloro)-phenylmethane(DAoCM).The maximum absorbance wavelength is 505nm for the uncatalytic reaction(the absorbance is A o)and the catalytic reaction (the absorbance is A).Beer’s law is obeyed in the concentration range of 0 0～120 0ng/25ml Ru(Ⅲ),and detection limit is 2 0×10 -10 g/ml.The apparent activation energy and apparent rate constant of this reaction are 75 33kJ/mol and 4 77×10 -4 /s,respectively.It has been applied to determine the trace amounts of ruthenium in ore samples with satisfactory results.
出处
《贵金属》
CAS
CSCD
北大核心
2000年第1期38-41,共4页
Precious Metals
关键词
钌
测定
高碘酸钾
测定
催化光度法
显色剂
Ruthenium,Diantipyryl-(o-chloro)-phenylmethane,Potassium periodate,Catalytic kinetic spectrophotometry
