低温浓缩-气相色谱/质谱法分析固定污染源废气中的丙烯腈

Determination of Acrylonitrile Emissions from Stationary Sources Using Cryogenic Preconcentration Followed by GC/MS

建立了固定污染源废气中丙烯腈的气袋采样-低温浓缩-气相色谱/质谱分析方法。结果表明,该法在丙烯腈质量浓度16.1~4 050μg/m^3范围内具有良好的线性,相关系数R^2>0.999,检出限为9.54μg/m^3,回收率、日内与日间精密度均符合质控要求,能够满足废气中丙烯腈分析的要求。

This study established a method for the determination of acrylonitrile using cryogenic pre-concentration followed by GC/ MS. The results showed that acrylonitrile was in good linearity within 16. 1 -4 050 μg/m^3 , and the correlation coefficient was larger than 0. 999. The detection limit was 9. 54 μg/m^3. Meanwhile, the average recovery, the with-in day and inter-day RSDs also met the requirements of quality control. The recoveries of spiked samples were between 86. 9% and 105.3% , which were stable enough to realize extensive use.