In the analysis of high purity gases (higher than 5N) by gas chromatography, peaks of oxygen and nitrogen impurities sometimes became negative, resulted in the failure of quantification.

• 摘要用气相色谱法测定5N以上的高纯气体时，有时氧或氮杂质的出峰方向变反，而无法对分析结果进行定量。