Diffusion denuder techniques, particulate

Mixtures of gases and particles can be separated by diffusion denuders combined with filter samplers. Chemically reactive gases are collected on the surface of selectively coated diffusion denuder tubes, whereas particulate components are collected on subsequently placed filters (Stevens et al. 1978 Klockow 1982). Until now, this method has been used exclusively for non-metallic components. Although it can be foreseen that denuder techniques may also be used for the separation of gaseous and particulate metallic components. 

A diffusion separator has been described as an alternative to the denuder for eliminating filtration artifacts (Eisenreich and Hornbuckle, 1997 Turpin et al., 1993,1997, 1999). The separator, which uses neither filters nor a denuder section, relies on the different mobilities of gases and particles to separate them. The technique was used to speciate particulate and gaseous PAHs in Minneapolis air (Eisenreich and Flornbuckle, 1997). Comparison of filter-... 

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