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利用流动注射荧光分光光度分析法研究了Ce~(3+)在KCl介质中的荧光性质.在实验的流动注射条件下,当KCl浓度大于0.3mol/L时,Ce~(3+)在pH<6.2的荧光强度不随酸度改变而变化.据此建立起了Ce~(3+)在pH5～6的流动注射荧光分析法.方法的线性范围是2.0×10~(-7)～2.0×10~(-6)mol/L,一元回归方程为△F=663600 C-0.053(n=10,r=0.9996),检测限为6.0×10~(-9)mol/L,测定频率120～150次/n.方法用于标准土壤、岩石及水系沉积物样品分析.结果与标准值一致,回收率分别为93.6%～102.1%,93.1%～105.8%,97.0%～108.4%(n=10),相对标准偏差分别是1.10%,4.31%,5.10%.
Fluorescence spectrophotometry was used to study the fluorescence properties of Ce 3+ in KCl solution. Under the condition of flow injection, when the concentration of KCl is above 0.3mol / L, Fluorescence intensity of <6.2 did not change with the change of acidity.Flow injection fluorescence analysis of Ce 3+ at pH 5 ~ 6 was established.The linear range of the method was 2.0 × 10 ~ (-7) ~ 2.0 × 10 The linear regression equation was △ F = 663600 C-0.053 (n = 10, r = 0.9996) with the detection limit of 6.0 × 10 -9 mol / L and the detection frequency of 120-150 The results were consistent with the standard values, and the recoveries were 93.6% -102.1%, 93.1% -105.8% and 97.0% -108.4%, respectively (n = 10) The relative standard deviations were 1.10%, 4.31% and 5.10% respectively.