|建立了用GC-FID同时测定空气中乙酸、丙酸的方法。乙酸、丙酸经硅胶管吸附后，用丙酮溶剂解吸，气相色谱分析。优化条件下，在20～2 000 mg/L范围内有良好的线性关系。方法检出限分别达到了1.0 mg/m3和0.5 mg/m3，相对标准偏差2.2 %和1.9 %，回收率在94 %以上。
|关键词: 乙酸 丙酸 硅胶管 气相色谱
|Determination of Acetic Acid and Propionic Acid in the Gas by GC combined with Adsorption by Silicon Tube
|A method for the analysis of acetic acid and propionic acid in the gas by GC-FID was set up. Acetic acid and propionic acid in the gas was adsorbed by silicon tube，desorbed by acetone and then determined by GC. The calibration at the concentration range 50-2000 mg/L was linear by the optimized method. The detection limit was 1.0 mg/m3 and 0.5 mg/m3.The relative standard derivations was 2.2% and 1.9%，and the recovery was higher than 94%.
|Key words: acetic acid propionic acid Gas chromatography silicon tube