氧化还原-邻菲罗啉分光光度法测定玻璃中铈的研究

采用在无银（Ⅰ）催化、0．5mol／L硫酸、0．1g／L过硫酸铵的溶液中，加热煮沸10min将铈（Ⅲ）氧化成铈（Ⅳ）后，加入一定量过量的Fe^2＋或Fe（Phen）3^2＋溶液与之作用，过量物在避光条件下用邻菲罗啉分光光度法测定，从而测得玻璃中的铈含量。分析了玻璃中的微量二氧化铈，S=0．002496，Cv〈5％，相对误差〈8％。前人的诸多研究都没有注意到溶液中存在的光化学还原干扰。

Determination of Cerium Content in Glass by Redox-O-Phenanthroline Spectrophotometry

The solution of 0.5 mol/L sulfuric acid and 0.1 g/L ammonium persulfate without silver （Ⅰ） catalyst was boiled for 10 min to turn cerium （Ⅲ） to cerium （Ⅳ）, followed by adding excess Fe^2＋ or Fe（Phen）3^2＋ solution to react therewith. The resultant was tested by o-phenanthroline spectrophotometry away from light to determine the cerium content in glass. The trace cerium deoxide was thus analyzed, with S=0.0024%, Cv〈5% and relative error 〈8%. Many previous studies made by other people did not note the photochemical reduction interference in the solution.