铀（Ⅵ）的拉曼光谱定量分析  

Determination of U（Ⅵ） by Raman Spectroscopy

作　　者：白雪[1] 李定明[1] 常志远[1] 谈树苹[1] 张倩慈[1] 

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《核化学与放射化学》2014年第B12期27-34,共8页Journal of Nuclear and Radiochemistry

摘　　要：建立了Purex后处理工艺水相和有机相料液中U（Ⅵ）的拉曼光谱分析方法。对于水相体系，870cm^-1处UO2^2＋的拉曼谱峰强度与U（VI）质量浓度在5．0-450．0g／L范围内呈现良好的线性关系，r^2=0．9999，检出限为1．2g／L。增加仪器的积分时间可以使U（Ⅵ）的检出限降至0．2g／L。硝酸、其他锕系元素与裂片元素的存在对U（VI）的检测无影响。对于含0．5～4．0mol／L硝酸的70．0g／LU（Ⅵ）溶液，6次检测的相对标准偏差均不高于1．4％。进行含有裂片元素的重加回收实验，重加回收率在98．3％～101．6％之间。在有机相体系，拉曼信号强度与U（Ⅵ）质量浓度在5．0～107．0g／L范围内呈现线性关系，r^2=0．9990，检出限为0．7g／L。该方法具有测定简便、无需考虑干扰、绿色无损等优点，可实现现场的快速检测，适用于水相和有机相中常量U（Ⅵ）的定量检测。A new method via Raman spectroscopy for determination of U（Ⅵ） in aqueous and organic solutions was developed. The concentration of U（Ⅵ） can be quantified by the Raman band of UO2^2＋ , which is 870 cm^-1 in aqueous solutions and 860cm^-1 in organic solutions. In the aqueous phase, a good linear relationship is obtained between the Raman signal and concentration of U（VI） in the range of 5.0-450.0 g/L, with the r^2= 0. 999 9. The detection limit is 1.2 g/L. The detection limit can be reduced to 0.2 g/L by increasing the integration time. The existence of nitric acid and fission products has no effect on the detection of U（Ⅵ）. The Sr is no more than 1.4%（n=6） for detection of 70.0 g/L U（Ⅵ）, with 0.5- 4.0 mol/L HNO3. The recoveries are in the range of 98.3%-101.6%. In organic solutions, the linearity is observed in the range of 5.0-107.0 g/L with r2 =0. 999 0 and a limit of detection of 0.7 g/L. With the advantage of simple, rapid, green and no interference of internal substance, the method is applicable for in situ detection of U （Ⅵ） in aqueous and organic solutions.

关 键 词：拉曼光谱 U(VI)定量 水相体系 有机相体系 

分 类 号：O657.37[理学—分析化学] O614.62[理学—化学]