This article refers toHJ-759andTO-15After improving the method, an experimental concept for instrument comparison and acceptance was proposed: using the same calibration gas and detector, a three-stage freeze pre concentration instrument was used for pre-treatment injection, a Suma tank was used for sampling, and online instrument detection was simulated. The chromatographic peaks of all compounds were added up and then quantified, and comparative analysis was conducted in the laboratory. This method provides a lower detection limit while also considering the detection of low-carbon compounds, which can more accurately detect and restore the true concentration of environmental atmosphere or factory atmosphere, making it suitable for online environmental atmosphereNMHCProvide reference for the comparison and acceptance of monitoring instruments.