建立惰气熔融-红外吸收法测定铀金属中氢含量的方法.将铀金属加工为柱状样品,用25%硝酸、去离子水、丙酮清洗并用冷风吹干后测定.对实验条件进行了优化,坩埚脱气功率为3500 W,脱气时间不低于70 s,脱气次数不低于5次,分析功率为3000 W,分析时间为60 s.该方法的检出限为0.02 μg/g,氢含量为1.05 μg/g的铀金属样品测定结果的相对标准偏差为17.9%(n=6),加标回收率为72.5%~127.3%.该方法灵敏、准确,适用于铀金属中微量氢含量的测定.%A method for determining hydrogen content in uranium metal by inert gas fusion-infrared absorption method was established. The uranium metal was processed into columnar sample and cleaned by 25% nitric acid, deionized water and acetone, and dried in cold wind. The experimental conditions were optimized, the degassing power was 3 500 W, degassing time was not less than 70 s, degassing number was not less than 5, analysis power was 3 000 W and the analysis time was 60 s. The detection limit of the method was 0.02 μg/g. For uranium metal sample which hydrogen content was 1.05 μg/g, the relative standard deviation of detetion results was 17.9%(n=6), the added recovery was 72.5%-127.3%. This method is sensitivity and accurate, it can be used to determine trace hydrogen content in uranium metal.
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