Photostability of nitro-polycyclic aromatic hydrocarbons on combustion soot particles in sunlight
Article Abstract:
A study of the photostability of particle-associated nitro-polycyclic aromatic hydrocarbons (NPAH) revealed that nitropyrenes and fluoranthenes decay very rapidly in sunlight on diesel and wood soot particles and half-lives that range from 0.5 to 1.2 h. Findings showed that the main loss pathway for NPAH on diesel soot and wood smoke was photodecay. Moreover, it was found that photodecomposition of NPAH was dependent on the solar radiation as well as the chemical and physical properties of the substrates. Temperature's effect was not observed to be significant.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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Ozone-nitrogen ioxide-NPAH heterogeneous soot particle reactions and modeling NPAH in the atmosphere
Article Abstract:
The reaction of nitro polycyclic aromatic hydrocarbons (NPAH) with ozone (O3) and with ozone with nitrogen dioxide (NO2) were investigated in chamber experiments. The presence of O3 led to the degradation of NPAH at 2 to 20 degrees Centigrade, with degradation rate constants of 0.0015 to 0.0025 ppm-1 min-1 for 1- and 2-nitropyrene and 2-, 3- and 8-nitroflyoranthene, respectively. However, there was a wide variation in the photodegradation of NPAH in daytime than at night, possibly due to the ability of sunlight to promote rapid degradation.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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A large gas-phase stripping device to investigate rates of PAH evaporation from airborne diesel soot particles
Article Abstract:
The evaporation rates of selected polycyclic aromatic hydrocarbons (PAHs) from airborne diesel soot particles occur very quickly. These rates, which were measured using a large gas-phase stripping device that is capable of removing samples within seconds, may be affected by PAHs off-gassing in the sampling denuder. The PAHs evaporation rates analyzed include phenathrene and fluorene.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1997
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