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本文采用汞阴极电解还原法制备了铀(Ⅲ)溶液,研究了在盐酸介质中各种氨羧络合剂乙二胺四乙酸二钠(EDTA)、二乙三胺五乙酸(DTPA)、1,2-环已烷二胺四乙酸(CyDTA)、三乙基四胺六乙酸(TTHA)和水溶性有机溶剂甲醇、乙醇和丙酮的存在对铀(Ⅲ)稳定性影响,测定了在不同盐酸浓度中铀(Ⅲ)和铀(Ⅳ)的吸收光谱。实验表明,在0.5-4.5mol/l盐酸浓度范围内铀(Ⅲ)的摩尔吸光系数为167cm~(-1)·mol~(-1)·l(波长521nm处),铀(Ⅳ)的存在并不干扰铀(Ⅲ)的测定。在铀(Ⅲ)浓度为0-6.0×10~(-3)mol/l之间,用于分光光度分析的标准曲线呈良好线性关系。
In this paper, uranium (Ⅲ) solution was prepared by mercury cathodic electrolysis reduction method. The effects of various ammonia-carboxylamine complex compounds such as disodium ethylenediaminetetraacetate (EDTA), diethylenetriaminepentaacetic acid (DTPA), 1 , Cyclic tartaric acid (CyDTA), triethylenetetraminehexaacetic acid (TTHA) and water-soluble organic solvents such as methanol, ethanol and acetone on the stability of uranium (Ⅲ) Absorption Spectrum of Uranium (Ⅲ) and Uranium (Ⅳ) in Concentration. The experimental results show that the molar extinction coefficient of uranium (Ⅲ) is 167cm -1 mol -1 -1 at the wavelength of 521nm in the range of 0.5-4.5mol / L hydrochloric acid. The presence of uranium (Ⅳ) Does not interfere with the determination of uranium (Ⅲ). In the uranium (Ⅲ) concentration of 0-6.0 × 10 -3 mol / l, the standard curve for spectrophotometry showed a good linear relationship.