Abstract:chromatography. The sample passed through a thermal desorption tube filled with Tenax TA at a flowrate of 200 mL/min for 10 minutes. After desorption at 300 ℃, the sample was sent to the gas chroma⁃tograph and detected by flame photometric detector. The standard curve was established with sulfur di⁃oxide standard gas in nitrogen for quantitative analysis. The results showed that the linear range ofsulfur dioxide was 47.0~960 nmol/mol and the quantitative repeatability was 6.6%. The detection limitwas 3.1 nmol/mol and the linear correlation coefficient (r) was 0.998 3. Inorganic sulfide and other in⁃organic gas did not interfere with the detection. The linear correlation coefficient (r) between this de⁃tection results and the trace sulfur dioxide monitoring results of the atmospheric automatic station was0.91. There was no significant difference between the variation of monitoring values and the analysisvalues with time. Close-