关键词: 环形溶蚀器-滤膜系统, 甲基乙二醛, 羰基化合物, 五氟苄基羟胺, 乙二醛

Abstract: A GC-MS method were developed using an O-( 2, 3, 4, 5, 6-pentafluorobenzyl) hydroxylamine hydrochloride (PFBHA) and XAD-4 coated annular denuder-filter pack (AD-FP) system for collecting gas and particle phase carbonyl compounds simultaneously. PFBHA was used as a derivatizing agent to coat the denuders and filters. When air flowed through the sampling system, the gaseous compounds were absorbed on the denuders while particles proceeded along the denuders and collected on the filters. The samples were extracted by n-hexane and concentrated, and then analyzed by GC-MS. The results suggest that the good collection efficiency can be achieved when the coating amount is 15 μmol (gas phase) and 0.8 μmol (particle phase) and the sampling flow rate is 5 L/min for 5 h. Collection efficiencies of carbonyl compounds were between 84% and 95%. The level of atmospheric concentration of carbonyl compounds showed seasonal variation (the concentrations of carbonyls in winter were higher than in summer) in Baoshan District, and the particle phase had a positive correlated with PM2.5. The gas-particle partitioning coefficient of carbonyl compounds was negatively correlated with temperature.

Key words: annular denuder-filter pack (AD-FP) system, carbonyl compounds, glyoxal, methylglyoxal, pentafluorobenzyl hydroxylamine (PFBHA)