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分光光度法测定 Gd_2O_3-UO_2烧结芯块氧与金属原子比(O/M)中,浓磷酸为溶剂,U~(6+)离子和U~(4+)离子的特征波长分别选为310nm 和544nm。U~(6+)离子和 U~(4+)离子浓度分别由其特征波长的吸光度值与标准曲线对比来确定。O/M 计算公式由物质内部电中性原理导出。实验表明,烧结芯块中 Gd_2O_3含量和芯块微观均匀性(固溶体含量)对 O/M 的分光光度测定没有影响,分光光度法测定 Gd_2O_3-UO_2芯块 O/M 具有简便、准确和可重复的特点,其标准偏差为0.003。
Spectrophotometric determination of the oxygen to metal atomic ratio (O / M) of the pellets of Gd_2O_3-UO_2 sintered with concentrated phosphoric acid as the solvent, the characteristic wavelengths of U ~ (6+) and U ~ (4+) ions were selected as 310nm and 544nm. The concentration of U ~ (6+) ions and U ~ (4 +) ions were determined by comparing their absorbance values with the standard curve. The O / M formula is derived from the internal neutral principle of matter. Experiments show that the content of Gd_2O_3 in the pellets and the uniformity of the pellets (solid content) have no effect on the spectrophotometric determination of O / M. The determination of O / M of Gd_2O_3-UO_2 pellets by spectrophotometry is simple, accurate and reproducible Features, the standard deviation of 0.003.