Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Photodegradation of wood smoke mutagens under low NOx conditions
Abstract Residential wood heating contributes large quantities of particulate matter and mutagens such as polynuclear aromatic hydrocarbons (PAH) to ambient air. In order to investigate the effect of sunlight on the atmospheric fate of particle-bound wood smoke mutagens, dilute wood smoke from a residential wood stove was added to 25 m3 outdoor Teflon chambers. The wood smoke was then allowed to age under ambient sunlight conditions and in the presence of low NOx (<0.1 ppm) and O3 (<0.06 ppm). PAH concentrations and the mutagenicity of particle extracts were determined in relation to residence time in the chamber. The direct acting mutagenicity of the particle extracts, as measured in Salmonella typhimurium strain TA 98-S9, showed no change after exposure to sunlight. In contrast, the indirect acting mutagenicity (TA 98 + S9) of wood smoke showed a 50–70% decay after aging in bright sunlight. This loss in mutagenicity was accompanied by a rapid decline in particle bound PAH concentrations. However, since only 10–25% of the decline in mutagenicity may be attributed to the reduction in PAH concentration, other indirect mutagens must also be degraded.
Photodegradation of wood smoke mutagens under low NOx conditions
Abstract Residential wood heating contributes large quantities of particulate matter and mutagens such as polynuclear aromatic hydrocarbons (PAH) to ambient air. In order to investigate the effect of sunlight on the atmospheric fate of particle-bound wood smoke mutagens, dilute wood smoke from a residential wood stove was added to 25 m3 outdoor Teflon chambers. The wood smoke was then allowed to age under ambient sunlight conditions and in the presence of low NOx (<0.1 ppm) and O3 (<0.06 ppm). PAH concentrations and the mutagenicity of particle extracts were determined in relation to residence time in the chamber. The direct acting mutagenicity of the particle extracts, as measured in Salmonella typhimurium strain TA 98-S9, showed no change after exposure to sunlight. In contrast, the indirect acting mutagenicity (TA 98 + S9) of wood smoke showed a 50–70% decay after aging in bright sunlight. This loss in mutagenicity was accompanied by a rapid decline in particle bound PAH concentrations. However, since only 10–25% of the decline in mutagenicity may be attributed to the reduction in PAH concentration, other indirect mutagens must also be degraded.
Photodegradation of wood smoke mutagens under low NOx conditions
Bell, Douglas A (Autor:in) / Kamens, Richard M (Autor:in)
Atmospheric Environment ; 20 ; 317-321
31.05.1985
5 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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