Abstract:Air samples were flushed and pumped into two-port stainless steel canisters and pressurized to 1.36×105 Pa by a custom-made sampler. The samplers were analyzed by a gas chromatography-mass spectrometry (GC-MS) system in the laboratory. The precisions of 6 major hydrofluorocarbons (HFCs) analysis were 0.24%~1.02%. The concentrations of 6 HFCs in the blank samples were below detection limits of GC-MS system. The influence caused by various inlet pressures fluctuation was corrected. The recoveries for 6 HFCs during sampling-analysis procedure were 99.5%~100.4% and there were not significant changes of the HFCs concentrations during 112-days storage. Air samples from the top of an 80-m tower at Shangdianzi regional station were sampled and analyzed. The concentration differences between two parallel samples were 0.04×10-12~0.16×10-12. The concentrations difference between canister samples and in-situ measurement were -0.17×10-12~-0.86×10-12. The sampling-analysis-quality control method was suitable for high precision atmospheric HFCs observation.