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Muralikrishua等曾试验在浓磷酸介质中用亚铁还原Mo(Ⅵ),然后用重铬酸钾溶液进行电位滴定以测定钼。我们作了进一步试验并试用于合金中8％以上钼的测定,获得满意结果。本法特点是干扰元素少,可不经分离直接测定。在磷酸浓度为12—13M时,Mo(Ⅵ)能被亚铁还原为Mo(V)。当用重铬酸钾溶液电位滴定时,可以看到二次明显的电位突跃。第一终点表示Fe(Ⅱ)被重铬酸钾完全氧化,第二终点表示Mo(V)全部氧化为Mo(Ⅵ),因此可借二个终点的
Muralikrishua et al. Tested the reduction of Mo (VI) with ferrous iron in concentrated phosphoric acid medium and potentiometric titration with potassium dichromate solution to determine molybdenum. We made further tests and tried more than 8% of the alloy molybdenum determination, to obtain satisfactory results. The law is characterized by less interference elements can be measured directly without separation. At a phosphoric acid concentration of 12-13M, Mo (Ⅵ) can be reduced to Mo (V) by ferrous. When potentiometric titration with potassium dichromate solution, you can see the second obvious potential jumps. The first end point indicates that Fe (II) is fully oxidized by potassium dichromate and the second end point indicates that all of Mo (V) is oxidized to Mo (VI)