光度法快速测定铌铁中铌

Determination of niobium content in niobite by spectrophotometric

铌铁易溶于硝酸和氢氟酸的混合酸中,当用酸分解试样时,铌极易水解析出沉淀;但在氢氟酸存在下,又能成为可溶性络合物(H_2NbF_7),所以在分析方法中,常用此特性,使铌保持于溶液中而用光度法进行铌的测定,实现光度法高速分析铌铁中的铌。

Ferroniobium is apt to be dissolved in the mixture of nitric acid and hydrofluoric acid. When using nitric acid to dissolve ferroniohium sample, niobium is very apt to occur hydrolytic precipitation,but under the presence of hydrofluoric acid, it can become soluble complex（HENbFT）, so in the niobium analysis, usually to use this characteristic to keep niobium being solved in the solution so as to determine niobium with photometry, realizing rapid determination of niobium in ferroniohium with photometry.