Tourky等曾将五价钨的溶液用于电位滴定。鉴于其还原电位较负(E_H~0=-0.03伏),难于避免空气氧化和滴定度的变化,而很少被采用。若将电解制得的五价钨直接用作库仑滴定剂,则可克服上述困难。基于以上想法我们研究了用五价钨作库仑滴定剂的条件,并用于锰(Ⅶ)、钒(Ⅴ)和铬(Ⅵ)的测定。结果表明:在适当的介质中,控制一定的电流密度范围,不仅六价钨能在阴极上定量还原,而 Tourky et al. Used pentavalent tungsten solutions for potential titration. In view of its more negative potential reduction (E_H ~ 0 = -0.03 volts), it is difficult to avoid changes in air oxidation and titer, and rarely used. If the electrolysis of pentavalent tungsten directly as a coulometric titrant, you can overcome these difficulties. Based on the above ideas, we studied the conditions of coulometric titration with pentavalent tungsten and were used for the determination of manganese (Ⅶ), vanadium (Ⅴ) and chromium (Ⅵ). The results show that: in a suitable medium, the control of a certain current density range, not only hexavalent tungsten in the cathode quantitative reduction, and