Abstract: Amethod for the analysis of trace CO and CO2 was establishedby high-pressure liquid injector-gas chromatographcombined with nickel conversion furnace. The precision, recoveries and minimum detection limits of the method were investigated, and the content of CO and CO₂ in the actual samples was analyzed. The results showed that the recovery of CO and CO₂ in the standard sample was 98.0%, and the relative standard deviations of the three replicates were less than 3%. The minimum detection limits of CO and CO₂ are 0.13 μL/L and 0.26 μL/L, respectively, which can completely meet the quality control requirements of CO and CO₂ in isopentane in full-density polyethylene process.

Key words: isopentane, carbon monoxide, carbon dioxide, nickel conversion furnace, high pressure liquid injection valve