四极质谱计测量天然水平氘氢丰度比技术研究

详细信息

Study on Measuring Natural Level Ratio of D and H by Quadrupole Mass Spectrometer

摘要: 自制了高温铬还原制氢装置，探索了降低H3+对HD+干扰的方法。以一套氘丰度为天然水平的国家一级标准水样中的两个样品作为标准，另外两个样品作为测试样品，在GAM400四极质谱计上探索了等H2+线性校正测量值的方法，利用双标准外标氘氢丰度比差值校准系数的方法对两个标准水样进行了测量，结果与国家标准值偏差为±0.1％，最终评估测量相对不确定度为0.8％。
- 四极质谱 /
- 氘氢丰度比 /
- 天然 /
- 标准水样
Abstract: A device with high temperature Cr inside was made to reduce water to hydrogen. The method for reducing the interferer of H3+ to HD+ was discussed. The two of the set of standard water samples which have natural level ratio of D and H as standards and the other two as unknown samples, a linear calibration method with equal H2+ was studied on GAM400 quadrupole mass spectrometer. And the difference calibrated coefficient of the ratio of D and H was obtained between two standards. The other two standard water samples was measured based on the methods and the coefficient. The measured results has ±0.1% bias to standard values. And the evaluated relative uncertainty is 0.8％.
- quadrupole mass spectrometer /
- ratio of D and H /
- natural /
- standard water