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本文叙述了一种测定空气中ppt级SF_6的气相色谱法,并简要介绍了在国内首次进行的SF_6大气扩散示踪试验中的应用。方法采用5A分子筛柱和氚钛源电子俘获检测器,其测量范围:直接进样为10~(-7)—10~(-10)(SF_6与空气体积比,下文同),液氮(或液氧)冷冻浓集进样为10~(-10)—10~(-12)。直接进样法的最低检出浓度达2×10~(-11)。在示踪试验范围六、七公里内,大气样品不需浓集处理可直接测定。
This paper describes a method for the determination of ppt SF_6 in air by gas chromatography and briefly introduces the application of the SF_6 atmospheric diffusion tracer test in China for the first time. Methods 5A molecular sieve column and tritium source electron capture detector were used. The measuring range was 10 -7 -10 -10 (SF 6 and air volume ratio, same as below), liquid nitrogen (or Liquid oxygen) frozen concentrated injection of 10 ~ (-10) -10 ~ (-12). Direct injection method of the minimum detectable concentration of 2 × 10 ~ (-11). In the tracer test range of six or seven kilometers, atmospheric samples without concentration can be directly measured.