Analysis of polycyclic aromatic hydrocarbons (PAHs) in airborne particles by direct sample introduction thermal desorption GC/MS

摘要: Abstract The technique of thermal desorption (TD)–GC/MS was evaluated for measuring airborne, 4–6 ring polycyclic aromatic hydrocarbons (PAHs) collected onto quartz filters. TD provides a more readily automated and sensitive alternative to traditional solvent extraction, decreasing the time/cost analysis reducing risk analyte loss or sample contamination. developed method successfully applied PAH standard solutions loaded on sorbent tubes packed with wool graphitized carbon black Carbograph2. optimized showed high efficiency over whole range target PAHs good precision, linearity sensitivity. proposed verified an urban dust Standard Reference Material (SRM 1649a); experimentally determined concentrations agreed certified ranges (95% confidence limit) all compounds except benzo[a]anthracene, which fell just outside narrow range. reproducibility by analysing pieces real filters sampled from air period 24 h. results confirmed homogeneity filter recovery efficiencies PAHs.