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    分光光度解谱法直接测定U、HNO3、HNO2混合组分浓度

    Simultaneous Determination of Uranium, Nitric Acid and Nitrous Acid by Direct Spectrophotometry

      摘要
    • 摘要: 将最小二乘法应用于分光光度解谱分析，在波长350～500nm范围内，利用U-HNO3-HNO2的吸收谱分别建立了HNO3水溶液和30%TBP煤油中U、HNO3、HNO2的分析方法。在水相ρ(U）=0.95～74.1g/L、c(HNO3) =3～5 mol/L、c(HNO2)=5×10-4 ～2×10-3 mol/L时，U、HNO3和HNO2测量的相对标准偏差分别为0.46%、0.68%和4.09%；有机相中，ρ(U）=0.95～74.1 g/L、c(HNO2)=5×10-4～2×10-3 mol/L时，U和HNO2测量的相对标准偏差分别为0.42%和4.2%。直接分光光度分析法简单、快捷、可靠，对Purex流程铀线中U、HNO3、HNO2的分析和控制很有意义。

       

      Abstract: A second-order derivative spectrophotometric method for simultaneous determination of uranium, nitric acid, and nitrous acid in Purex process was developed. The molar absorbance matrix was calibrated with absorbance data measured in the wavelength range 350-500 nm for a series of standard solutions by linear least-squares regression. This method uses the information from the absorption spectra of U(Ⅵ) nitrous acidnitric acid solutions to determine U(Ⅵ), nitrous acid, and nitric acid. In the ranges of 0.95-74.1 g/L U(Ⅵ), 5×10-4-2×10-3 mol/L nitrous acid and 3-5 mol/L nitric acid aqueous solution, the measuring precision for determination of U(Ⅵ), nitric acid, and nitrous acid are 0.46%, 0.68%, 4.09% respectively. In the solution of 30%TBP-kerosene, the measuring precision for determination of U(Ⅵ) and nitrous acid are 0.42% and 4.2% respectively in the ranges of 0.95-74.1 g/L U(Ⅵ) and 5×10-4-2×10-3 mol/L nitrous acid. The spectrophotometric method could be valuable for monitoring and controlling of both species in Purex process

       

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