Application of a new methodology for determining polycyclic aromatic hydrocarbons (PAHs) in atmospheric aerosols using different filter configurations, PUF and XAD-Denuder
Cereceda-Balic, Francisco; Fadic, Ximena; Vidal, Víctor; Díaz-Robles, Luis
Palavras-chave: PAHs, XAD-Denuder, Air Toxics, Particulate Matter, Temuco.
Resumo: Recognizing that the Polycyclic Aromatic Hydrocarbons (PAHs) are semi volatile organic compounds (SVOCs), are distributed between the gas phases (GP) and the atmospheric particulate matter (PM), and have a recognized toxicity, it is increasingly important that their analysis was as reliable as possible. For this purpose, the combination of different kinds of membrane filters has been used frequently, as well as polyurethane foam filters (PUF), to sample the gaseous phase. However, this technique is unreliable for determining the distribution between the phases, due mainly to different types of sampling artifacts. Considering this issue, a new methodology for determining the PAHs phase distribution is proposed. This technique involves the utilization of the combination of parallel cartridges, one equipped with membrane filter and PUF (F+PUF) and other with F+PUF+ XAD Denuder (XAD-D). This methodology was proved in a PAHs monitoring campaign in the urban air of Temuco, Chile, in winter season and the obtained results indicate using the combination of cartridge (F+PUF) and (F+PUF+ XAD), we are reducing the effect of sampling artifacts on the determination of the atmospheric concentration of PAHs.
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