【摘要】 为了准确分析高浓度SF₆中痕量的CO及CO₂,发展了可靠的气相色谱-火焰离子化检测器（GC-FID）方法。通过双Porapak Q色谱柱结合阀切换将SF₆从待测样品中分离并排出检测系统,从而避免SF₆可能造成的在线转化柱中毒现象,同时实现CO和CO₂的完全分离;通过在线镍催化将CO和CO₂的检测转化为对CH₄的检测,极大地提高检测灵敏度。结果显示,该方法对CO和CO₂的检测互不干扰,两者都可在2～500μL/L范围内呈现良好的线性相应,测定重复性好（RSD小于2%）,准确度高。建立的GC-FID方法可直接用于SF₆高压断路器中痕量CO及CO₂的检测,为SF₆相关电气设备潜伏性故障诊断提供了研究手段。更多还原

【Abstract】 A reliable gas chromatography-flame ionization detector（GC-FID） method was developed for the accurate determination of trace CO and CO₂ in high concentration of SF₆. Using a combination of dual Porapak Q chromatographic columns with valve switching, SF₆ was separated from the tested samples and blown out of the detection system, with the aim of ruling out the possibility of conversion column poisoning. Meanwhile, CO and CO₂ were on-line separated and subsequently converted to CH₄ in the presence of a nickel catalyst to increase the sensitivity for the determination of carbon-borne gases. The results showed that neither gas interfered with the determination of the other. Satisfactory linearities were achieved in the range 2-500 μL/L for both CO and CO₂, with highly accurate and reproducible determination（RSD<2%）. The developed GC-FID method is applicable to the determination of gases lodged in high-voltage circuit breakers toward the analysis of trace CO and CO₂, thus providing a tool for probing the potential breakdown of SF₆-insulated equipment.更多还原