质谱法精密测定重水中的氢同位素丰度

Accurate Determination of the D2O Hydrogen Content by Isotope Mass Spectrometer

介绍了用高分辨气体质谱计精密测定重水中氢同位素丰度的分析方法．实验自制了一套重水分解系统，以金属铀作还原剂，在一定的温度下还原重水为氘气．采用低温活性碳作为吸收剂，将样品分解、制备成气体试样，用高分辨气体质谱计测定重水中氢同位素丰度．该方法测定高浓度（〉99％）重水的氘丰度，测量结果的相对标准偏差不大于0．02％。

The isotopic composition of hydrogen in heavy water was analyzed by using a high-resolution mass spectrometer. A heavy water decomposition system was built, which used uranium metal as reducing agent, and used cryogenic active carbon as absorbent to create and collect deuterium gas. The results showed that high concentration hydrogen isotopic composition can be analyzed and the RSD less than 0.02%.