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该方法是在有氯化亚锡和丙酮的盐酸——酒石酸介质中与硫氰化钾生成H[NbO(CNS)_4]的黄色络合物,其最大吸收波长为385mμ。 耐热合金中除碳,硫,磷外,其他元素几乎都有干挠,因此应预先分离。耐热合金试样中含有一定数量的钨,故我们利用钨酸代替单宁酸,在盐酸介质中吸附铌酸共同沉淀,然后利用酒石酸和钨形成络合物,使钨不与硫氰化钾作用,省去钨与铌分离的这一过程,缩短铌的测定时间。
The method is to generate yellow complex of H [NbO (CNS) 4] with potassium thiocyanate in hydrochloric acid-tartaric acid medium containing stannous chloride and acetone, and the maximum absorption wavelength is 385mμ. Heat-resistant alloys in addition to carbon, sulfur, phosphorus, the other elements have almost dry scratch, it should be pre-separation. Heat-resistant alloy samples contain a certain amount of tungsten, so we use tungstic acid instead of tannic acid, hydrochloric acid in the medium niobate adsorption co-precipitation, and then the use of tartaric acid and tungsten complex formation, so that tungsten and potassium thiocyanate Role, eliminating the tungsten and niobium separation process, shorten the niobium determination time.