摘要
利用某些试剂（柠檬酸、酒石酸、草酸及丙二酸）对钨（Ⅵ）、钼（Ⅵ）催化作用抑制程度的差异，对钨（Ⅵ）、钼（Ⅵ）进行了同时测定。先对一组标准钨（Ⅵ）、钼（Ⅵ）混合溶液进行校正计算并建立了线性和非线性的两种模型，再对含量在０．０１２～０．２０μｇ／ｍＬ范围内的未知钨（Ⅵ）、钼（Ⅵ）含量的混合溶液进行了浓度预报。以碘离子选择电极量测催化反应过程中体系的电位变化，并以此值表示催化反应的速率。
Tungsten(Ⅵ)and molybdenum(Ⅵ)have similar catalytic behavior and they all have catalytic effects on the oxidation of iodide by hydrogen peroxide in acidic medium.There is,however,different inhibition in the catalytic activity of each catalyst in the presence of suitable organic reagents.In this paper,two equal sets of standard mixtures of tungsten(Ⅵ)and molybdenum(Ⅵ)were used as the catalysts in the experiments with and without the presence of Organic reagents,respectively.The reaction rate was measured potential by an iodic ion selective t3lectrode.Two multivariate calibration models,linear and nonlinear,were then developed.The catalytic behavior of tungsten(Ⅵ)and molybdenum(Ⅵ)in the presence of different organic acids(citric,tartaric,oxalic and malonic)was investigated.The two calibration models were successfully applied to the prediction of unknown samplesof trace tungsten(Ⅵ)and molybdenum(Ⅵ)in the range of 0.012-0.20μg/mL.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1994年第6期819-823,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
江西省自然科学基金
关键词
催化动力学
钨
钼
多元校正
测定
Kinetic-catalytic method,Tungsten and molybdenum,Multivariate calibration,Simultaneous determination,Iodic ion seiective electrode
