Abstract:
Atmospheric semi-volatile organic compounds (SVOCs), including polycyclic aromatic hydrocarbons
(PAHs), are ubiquitous environmental pollutants, which may be present in the gaseous phase and
adsorbed onto the surface of aerosol particles. A novel portable miniature denuder consisting of two
multi-channel silicone rubber traps separated by a quartz fibre filter has been developed for such
applications. It allows for the concentration of SVOCs in each phase to be determined, which is
important for human health risk assessments. The overall particle transmission efficiency through the
denuder was found to be 92 ± 4% for particles between 16 and 320 nm. SVOCs in the traps (gas phase)
or on the filter (particle phase) are analysed by GC-MS, or by GCxGC-MS for enhanced separation
capability. This enhances detection limits and allows for lower sampling flow rates and shorter sampling
times. These denuders have been applied in studies involving the monitoring of emissions from
domestic fires, vehicles and underground mine diesel engines.
