流动注射化学发光法测定稀土矿中三价铽  

Determination of Trivalent Terbium Ion in Mineral by Flow Injection Chemiluminescence

作　　者：王晓丽[1] 赵慧春[1] 李夏[2] 陈世稆[1] 

机构地区：[1]北京师范大学化学系 [2]首都师范大学化学系,北京100037

出　　处：《分析化学》2005年第5期647-649,共3页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金(No.G1998061308);北京市自然科学基金(No.2022007)资助项目

摘　　要：NaIO4H2O2是弱的化学发光体系,而Tb3+与EDTA形成的络合物对NaIO4H2O2的化学发光有显著的增敏作用,而且Tb3+EDTANaIO4H2O2体系的相对发光强度与Tb3+浓度成正比,在选定的最佳实验条件下,Tb3+的浓度与化学发光强度在1.0×10-7～1.0×10-5mol/L之间呈良好的线性关系;检出限为8.0×10-9mol/L;对浓度为1.0×10-6mol/L的Tb3+进行12次平行测定,相对标准偏差为3.2%。利用该方法成功的测定了矿样和稀土氧化物中的铽的含量。A simple flow injection chemiluminescence(CL) analysis method for the determination of terbium in mineral sample is reported. It is based on luminescence produced by NaIO4-H2O2 CL system sensitized by [Tb(EDTA)(2)](-). The relative chemiluminescence intensity of the Tb3+-EDTA-NaIO4-H2O2 system is proportional to the amount of Tb3+. The maximum CL intensity was obtained at concentration of 2.0 x 10(-3) mol/L EDTA, 0.048% H2O2 and 1.0 X 10(-2) mol/L NaIO4. The linear range and detection limit for Tb3+ are 1.0 x 10(-7) similar to 1.0 x 10(-5) mol/L and 8.0 x 10(-9) mol/L, respectively. The relative standard deviation for 12 independent determinations of 1.0 x 10(-6) mol/L Tb3+ was 3.2%. This method was successfully applied to the determination of terbium in rare earth oxide and mine. And the mechanism of chemiluminescence was proposed.

关 键 词：流动注射化学发光法 稀土矿 三价铽 测定方法 发光机理 氧化物 分析方法 动力学 

分 类 号：P575[天文地球—矿物学]