氦中痕量H2、D2组分的高精度气相色谱分析

为满足聚变堆氘氚燃料循环工艺气体中痕量氢同位素组分的特殊检测分析要求，需建立快速、高精度的在线分析方法。针对氦中痕量H₂、D₂组分，本工作以高纯氦为载气，在液氮温度下，使用自制改性Al₂O₃毛细管柱进行分离，放电氦离子化检测器进行检测。结果显示，氢氘组分的检测限不高于1×10^-8，保留时间不高于180 s，氢氘组分色谱峰峰面积响应值的相对标准偏差不大于1.0%，分离度大于1.0。本方法具有分析灵敏、快速的优点，为聚变堆包层在氘氚燃料注入系统和氢同位素分离系统中微量氚的安全分析与精确计量提供了一种有效的测量技术。

Analysis of Trace Hydrogen and Deuterium in Helium by High-precision Gas Chromatograph

It’s necessary to establish a high-precision analytical method of gas chroma-tography for achieving the rapid detection of trace components in fuel cycle system of fusion reactors. H 2 and D2 in high purity helium were separated with a handmade cryogenic capillary column of Al2 O3 ,and measured by discharge ionization detector. The results show that the detect limit of this method is less than 1 × 10 -8 ,retention time is less than 180 s,the relative standard deviation of area response of H 2 and D2 is not more than 1.0%,and the resolution of H 2 and D2 is above 1.0.This method is sensitive and fast,and can be applied to fuelling system and isotope separation system of fusion reactors for tritium safety analysis and accurate measurement.