离子选择电极法测定铀及铀铌合金中的微量氮

Determination of Trace Nitrogen in Uranium and Uranium-Niobium Alloy by Ion-Selective Electrode Method

摘要: 采用离子选择电极分析技术测量了铀及铀铌合金中的微量氮，确定了ISA作为离子强度调节剂缓冲溶液时该方法的最佳试验条件。结果表明，温度控制在（25±1）℃、pH=4.5~5.0，铵离子电极检测下限为0.03 mg/L，回收率为85%~98%，方法的测量相对标准偏差小于15%；在氮含量为30~80 μg/g范围内，测氮结果与传统分光光度法基本一致。

Abstract: Determination of trace nitrogen in uranium and uranium-niobium alloy was studied by ion-selective electrode method. Optimal measurement conditions were obtained by using ISA as ionic strength adjustment buffer. The results show that determination limit of nitrogen is 0.03 mg/L when temperature is (25±1)℃ and the pH value ranged from 4.5 to 5.0. The recovery rate is 85%-98%, and relative standard deviation is less than 15%. This method can give consistent results with those obtained by traditional spectrophotometric method for the determination of nitrogen content ranging from 30μg/g to 80μg/g.