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建立了双柱阀切换技术分析大气样品中SF_6浓度的GC—ECD方法。采用φ3.2 mm×1 m 5A分子筛(粒径为0.246～0.369 mm)柱为预柱,φ3.2 mm×0.5 m 5A分子筛(粒径为0.1 75～0.246 mm)柱为分析柱。在实验条件下,平均峰高响应为1.08×10~(-14)mL/μV,SF_6峰高响应的相对标准偏差为2.2%,SF_6的最低检测限为6.03×10~(-13)mL(3倍基线噪音)。采用该方法分析大气中SF_6浓度,样品分析时间为1.2 min,大大缩短了样品分析时间。12 min内完成11个空气样品分析,相对标准偏差2.1%。
A GC-ECD method for analyzing the concentration of SF_6 in the air sample was established by using the dual-column valve switching technology. The column of φ3.2 mm × 1 m 5A molecular sieve (particle size 0.246 ~ 0.369 mm) was used as the precolumn and the column of φ3.2 mm × 0.5 m 5A molecular sieve (particle size 0.175 ~ 0.246 mm) was used as the analytical column. Under the experimental conditions, the average peak height response was 1.08 × 10 ~ (-14) mL / μV, the relative standard deviation of SF_6 peak response was 2.2%, and the minimum detection limit of SF_6 was 6.03 × 10 ~ (-13) mL 3 times baseline noise). Using this method to analyze the concentration of SF_6 in the atmosphere, the sample analysis time was 1.2 min, which greatly shortened the sample analysis time. Eleven air samples were analyzed within 12 min, with a relative standard deviation of 2.1%.