流动注射荧光分光光度法在研究氯化钾-铈(Ⅲ)荧光特性中的应用

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%.

AN APPLICATION OF THE FLOW INJECTION FLUORESCENCE ANALYSIS IN THE STUDY OF THE CHARACTERISTICS OF CERIUM (III) IN POTASSIUM CHLORIDE MEDIUM

me fluorescence characteristics of Ce; in KCI medium by flow injection analysis (FIA) were studied. On the condition of FIA experiment and with the concentration of KCI higher than 0. 3 mol / L and PH less than 6. 2, the fluorescence intensity of Ce3+ does not change with the acidity. According to this , we established the fluorescence FIA method of Ce3+ in pH 5-6. This method has a good lineship in the range of 2. OX 10-7-2. OX 10-6mol/L which can be expressed by the equation of F= 663600c-0. 053(n= 10,r=0. 9996). The determination limit was 6. OX 10-9mol/L and 120-150 samples could be determmed in an hour. The results were corespondent with the standard values of the reference materials when the method was applied in analysis of the reference soil, rock and stream sediment samples. The recobery ratios for soil, rock and streament sediment were 93. 6%- 102. \%, 93. 1%-105. 8%, 97. 0%-108. \% (n=10) and RSDS were 1. 1%, 4.31%, 5. 10% respectively.