热导检测技术在线分析氢同位素气体

On-Line Analysis of Hydrogen Isotopes With Thermal Conductivity Detector

以高纯氕作载气,对热导检测技术（TCD）在线分析氢同位素气体进行了实验研究,考察了进样压力、氘丰度以及样品中HD含量对测量结果的影响。实验结果表明,TCD对氘的响应与氘的压力呈良好的线性关系;对已知氘丰度为1%～90%的氕氘混合物样品进行了测定,测量结果的误差与氕氘混合气体中的HD丰度成正比,绝对误差范围在0.000～0.025。

On-line analysis of hydrogen isotopes with thermal conductivity detector（TCD） using H2 carrier gas was experimentally studied.Moreover,the influence of the sample gas pressure,deuterium concentration and HD content on measured results was investigated and discussed.The experimental results show that a good linear relation between TCD response to the partial pressure of deuterium is obtained.Various H2-D2 mixtures with 1%-90% deuterium concentration were used to verify this method.The error between measured value and theoretical value is in direct proportion to the HD content. The absolute error range is 0.000-0. 025.