间接荧光光度法测定痕量铈

基于在无荧光性的铈（Ⅳ）体系中加入抗坏血酸后生成有特征荧光的铈（Ⅲ）离子，体系中再加入一定浓度的甲醛溶液后，新体系的荧光性得到更大强度的增敏．据此建立了一种间接测定痕量铈（Ⅳ）离子的新方法．利用该方法铈（Ⅳ）离子浓度在1×10^-6mol／L～1×10^-4mol／L范围内呈良好的线性关系，检出限为7．2×10^-6mol／L．此方法具有操作简便、灵敏度高、选择性好等优点．

Determination of Trace Cerium by Indirect Fluorescent Spectrophotometry

This paper describes a new method for determination of trace amounts of cerium. The principle of the method as follows：Ce （IV） system which was absent of fluorescence became a characteristic fluorescence of Ce （Ⅲ） ion by adding ascorbic acid into Ce （IV） system,and re - adding a certain concentration formaldehyde solution, the new system had greater fluorescence intensity of the sensitizer. Thereby a new method of an indirect determination of trace cerium （IV） ion was established. With this method Cerium （IV） ion concentration in the 1 ×10^-6mol/L - 1 ×10^-4mol/L range showed good linearity, and detection limit was 7.2×10^-6mol/L. This method is simple ,sensitive and selective.