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Iinuma和Yoshimori曾经用库仑滴定法测定钼,他们预先将六价钼用锌汞齐还原至三价,以过量的三价铁氧化三价钼,析出来的二价铁再用电解产生的氧化剂进行库仑滴定,从而得到钼的测定。由于三价钼是非常強的还原剂,在空气中极易被氧化,必须在隔离空气的条件下进行,因而此法比较麻烦,操作不便,而且准确度也不够高。 Kolthoff和Tomi(?)ek曾用三价钛对钼酸盐进行电位滴定,他们在5—10％的盐酸介质中,温度为75—80℃时得
Iinuma and Yoshimori used coulometric titration of molybdenum, which previously reduced hexavalent molybdenum to trivalent zinc amalgam, oxidized the trivalent molybdenum with an excess of trivalent iron, and precipitated divalent iron was oxidized with electrolytes Coulometric titration, resulting in the determination of molybdenum. Since trivalent molybdenum is a very strong reducing agent, it is easily oxidized in the air and must be isolated under the conditions of air. Therefore, this method is troublesome, inconvenient in operation, and not high in accuracy. Kolthoff and Tomi (?) Ek potentiometric titration of molybdate with trivalent titanium in 5-10% hydrochloric acid medium at a temperature of 75-80 ℃