铀铌合金中微量碳的测定

Determination of trace carbon in uranium-niobium alloy

研究了用碳硫分析仪测定铀铌合金中的微量碳的影响因素。钨粒加铁片是铀铌中碳释放的良好助熔剂 ;用硝酸 ( 1 + 1 )可有效去除铀铌试样表面上的吸附碳 ;在空气条件下清洗铀铌试样 ,其表面对碳的吸附不显著 ;不同的试样加工方式对铀铌试样中碳量的测定有一定影响。本方法适用于碳量为 40～ 1 0 0 0μg/g的铀铌试样中碳的测定。相对标准偏差 1 0 %

The affecting factors for determination of trace carbon in uranium niobium alloy were studied. The granulated tungsten adding to iron chip is a good accelerator for releasing the carbon in U Nb alloy. The carbon on U Nb alloy surface can be removed by HNO 3(1+1) in air. The mode for sample preparation affects the carbon content in U Nb alloy. The range for carbon determination is 40～1000 μg/g,and the standard uncertainty is less than 10%.