前言稀有元素钒及其氧化物常用作化学反应的触媒,其含量往往影响触媒的催化性能,因此精确地测定触媒中钒的含量,对评价触媒的性能不无益处。一般测定钒的方法有高锰酸钾滴定法、分光光度法、极谱法、及动力学法等,后者适用于微量钒的测定。有关文献报导了利用各种有机物,例如阿米酚、枣红R染料、五倍子酸、苯肼对磺酸、N—笨基对苯二胺等对钒的动力学法测定,其中Shigenorf Nakano等提出的利用钒(▽)对N—苯基对苯二胺(PPD)与N,N—二甲基苯胺(DMA)的偶联反应具有 Preface The rare elements vanadium and its oxides are commonly used as catalysts for chemical reactions. The content of them often affects the catalytic performance of the catalyst. Therefore, accurately determining the content of vanadium in the catalyst is of no benefit in evaluating the performance of the catalyst. Common methods for the determination of vanadium potassium permanganate titration, spectrophotometry, polarography, and kinetic methods, the latter for the determination of trace amounts of vanadium. The literature reports the kinetic determination of vanadium using various organic compounds such as amiloride, purplish red R dye, gallic acid, phenylhydrazine sulfonic acid, N-stupid para-phenylenediamine and the like, of which Shigenorf Nakano et al. The coupling reaction of vanadium (▽) on N-phenyl-p-phenylenediamine (PPD) and N, N-dimethylaniline (DMA)