论文部分内容阅读
国外曾有人提出在大于11.5M的磷酸介质中,用亚铁直接还原滴定水相中六价钼。方法简便,测定纯钼溶液中的钼,准确度高。但由于变价元素如铀,铬等严重干扰,限制了方法的应用。我们在观察了一些元素对亚铁还原滴定钼的影响后,选用六偏磷酸钠络合消除铀的干扰,同时,用抗坏血酸还原隐蔽Cr(Ⅵ),Ce(Ⅳ)等元素的干扰(此
Abroad has been proposed in more than 11.5M of phosphoric acid medium, titration with hexavalent molybdenum direct reduction of ferrous water. The method is simple and convenient. The determination of molybdenum in pure molybdenum solution has high accuracy. However, due to the price of elements such as uranium, chromium and other serious interference, limiting the application of the method. After observing the influence of some elements on molybdenum reduction by ferrous reduction, we chose hexametaphosphate complex to eliminate the interference of uranium. At the same time, the interference of hidden Cr (Ⅵ), Ce (Ⅳ) and other elements by ascorbic acid reduction