Lingane等早期对钨酸钠溶液电化学行为的研究表明五价钨可以由电化学还原钨酸钠溶液的方法来产生。后来,Tourky等曾在10.5N盐酸介质中电解还原钨酸钠溶液制得了W(V)的溶液,经重铬酸钾标定后用于电位滴定。钨酸盐体系的标准氧化还原电位为-0.03伏,故W(V)是一种较强的还原剂。它在空气中很不稳定,对于普通容量分析用作标准溶液很不方便。 Lingane and other early studies on the electrochemical behavior of sodium tungstate solution showed that pentavalent tungsten can be generated by electrochemical reduction of sodium tungstate solution. Later, Tourky et al. Had electrolyzed the sodium tungstate solution in 10.5N hydrochloric acid to prepare a solution of W (V), which was titrated with potassium dichromate for potential titration. The standard redox potential of the tungstate system is -0.03 volts, so W (V) is a stronger reducing agent. It is very unstable in the air and is not convenient for normal capacity analysis as a standard solution.