Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Sampling of carbonaceous particles in the atmosphere
Abstract A method for measurement of atmospheric carbonaceous particulate matter is proposed and evaluated. A diffusion denuder, placed ahead of a filter, is used to exclude vapor-phase organic compounds which might be retained by adsorption on the filter. The carbonaceous material lost by volatilization from the filter after collection is retained with a fluidized bed of powdered Al2O3. The efficiencies of the denuder and Al2O3 were evaluated with vapor phase phenanthrene and octadecane. Atmospheric sampling was done at two urban and one background site in California using the proposed technique in parallel with conventional hi-vol and dichotomous samplers. Hi-vol samples appear to have lost up to half of the particle phase carbon during sampling. About half this error could be eliminated by sampling at low face velocity. The effects of face velocity appear to distort the proportions of fine and coarse particulate carbon obtained with a dichotomous sampler.
Sampling of carbonaceous particles in the atmosphere
Abstract A method for measurement of atmospheric carbonaceous particulate matter is proposed and evaluated. A diffusion denuder, placed ahead of a filter, is used to exclude vapor-phase organic compounds which might be retained by adsorption on the filter. The carbonaceous material lost by volatilization from the filter after collection is retained with a fluidized bed of powdered Al2O3. The efficiencies of the denuder and Al2O3 were evaluated with vapor phase phenanthrene and octadecane. Atmospheric sampling was done at two urban and one background site in California using the proposed technique in parallel with conventional hi-vol and dichotomous samplers. Hi-vol samples appear to have lost up to half of the particle phase carbon during sampling. About half this error could be eliminated by sampling at low face velocity. The effects of face velocity appear to distort the proportions of fine and coarse particulate carbon obtained with a dichotomous sampler.
Sampling of carbonaceous particles in the atmosphere
Appel, B.R. (Autor:in) / Tokiwa, Y. (Autor:in) / Kothny, E.L. (Autor:in)
Atmospheric Environment ; 17 ; 1787-1796
14.02.1983
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Hospital indoor respirable particles and carbonaceous composition
| Elsevier | 2005
Hospital indoor respirable particles and carbonaceous composition
| Online Contents | 2006
Hospital indoor respirable particles and carbonaceous composition
| British Library Online Contents | 2006