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建立了一种测定UO_2-Gd_2O_3烧结芯块氧与金属原子比(简称O/M比)的新方法——分光光度法。以浓磷酸为溶剂,U~(6+)和U~(4+)离子的特征吸收波长分别确定在310nm和544nm。U~(6+)和U~(4+)离子浓度分别由其特征波长的吸光度与相应的标准曲线对比来确定。计算O/M比的公式由物质内部电中性原理导出。实验结果表明,烧结芯块中钆的含量和微观均匀性对O/M比的分光光度法测量没有影响。分光光度法测量UO_2-Gd_2O_3烧结芯块的O/M比具有操作简单、准确、重复性好的特点。其标准偏差为±0.003。
A new method for the determination of oxygen to metal atomic ratio (abbreviated as O / M ratio) of UO_2-Gd_2O_3 sintered pellets was established - spectrophotometry. With concentrated phosphoric acid as solvent, the characteristic absorption wavelengths of U ~ (6+) and U ~ (4+) ions were determined at 310nm and 544nm, respectively. The concentration of U ~ (6+) and U ~ (4 +) ions were determined by comparing the absorbance at their characteristic wavelength with the corresponding standard curve. The formula for calculating the O / M ratio is derived from the internal neutral principle of matter. The experimental results show that the content of gadolinium in the sintered pellets and the microscopic uniformity have no effect on the O / M ratio spectrophotometry. The spectrophotometric measurement of O / M ratio of UO_2-Gd_2O_3 sintered pellets is simple, accurate and reproducible. The standard deviation is ± 0.003.