A new ozone denuder for aerosol sampling based on an ionic liquid coating

Albinet, Alexandre; Papaiconomou, Nicolas; Estager, Julien; Suptil, Joël; Besombes, Jean-Luc
January 2010
Analytical & Bioanalytical Chemistry;Jan2010, Vol. 396 Issue 2, p857
Academic Journal
A new ionic liquid 1-octyl-3,5-dimethylpyridinium iodide ([O35LUT]+[I]−) was synthesized and utilized as coating for an ozone denuder device based on a high-volume aerosol sampler (30 m3 h−1). Particle transmission of the denuder was studied, and over 99% of particles ranging from 10 to 2,500 nm were transmitted. The device, containing 4.66 g of ionic liquid, was used outdoors, under dry and damp atmospheric conditions. In order to expose the device to an average concentration of 120 ppbv (240 µg m−3) of ozone in air, an additional production of ozone was directly injected into the denuder. Under these conditions, over 97% of ozone was removed for approximately 120 h (5 days). Therefore, iodide-based ionic liquids can be used as a new alternative to conventional denuder coatings in order to reduce artifacts occurring during sampling of particulate matter. Future applications are not limited to ozone removal for specific aerosol sampling methods. [Figure not available: see fulltext.]


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