高分辨气体同位素质谱法测定重水的氘同位素丰度

Determination of Deuterium Isotope Abundance in Heavy Water Based on High Resolution Gas Isotope Mass Spectrometry

基于高分辨气体同位素质谱技术,建立重水的氘同位素丰度测定方法。取10μL样品与轻金属镁条在200℃条件下反应2 h,将生成的氘气(D_(2))引入高分辨气体同位素质谱仪中检测离子流强度,数据代入推导出的计算公式计算得到氘同位素丰度。测试结果表明:通过精确地配制高、中、低不同氘同位素丰度的重水样品,利用计算公式得出的测量值与配置值偏差均小于0.3 atom%D,标准偏差均小于0.1%,方法适用的氘同位素丰度范围为0.015~99.8 atom%D。方法可为质谱测定重水中氘同位素丰度提供准确可靠的检测方法。

A method for the determination of deuterium isotope abundance of heavy water was established based on high-resolution gas isotope mass spectrometry.10μL sample was taken to react with magnesium ribbon at 200℃for 2 h.The generated deuterium gas(D 2)was introduced into the high-resolution gas isotope mass spectrometer to detect the ion current intensity,and the deuterium isotope abundance was finally obtained after putting the data into the derived formula.The test results showed that:Based on the accurate preparation of heavy water samples with high,medium,and low deuterium isotope abundances,the deviations between the measured value and the configured value calculated by the formula were all less than 0.3 atom%D,the standard deviation of each result was also less than 0.1%,and the range of deuterium isotope abundance applicable to this method was 0.015~99.8 atom%D.The method has been verified to be accurate and reliable in detecting the abundance of deuterium isotope in heavy water by mass spectrometry.