Factors influencing the reactivity of polycyclic aromatic hydrocarbons adsorbed on filters and ambient POM with ozone |
| |
| Institution: | 1. China State Institute of Pharmaceutical Industry, Shanghai, PR China;2. Shanghai Key Laboratory of Crime Scene Evidence, Shanghai Institute of Forensic Science, Shanghai, PR China;3. Shanghai Center for Drug Evaluation and Inspection, Shanghai, PR China;1. Department of Agricultural Sciences, University of Naples “Federico II”, via Università 100, 80055 Portici, Naples, Italy;2. Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-26, 08034 Barcelona, Catalonia, Spain;1. Architectural Engineering Department, Penn State University, University Park, PA 16802, USA;2. Nanyang Technological University and Berkeley Education Alliance for Research in Singapore, 138602, Singapore;3. Department of Mechanical and Materials Engineering, Portland State University, Portland, OR 97207, USA;4. Lawrence Berkeley National Laboratory, Environmental Energy Technologies Division, Indoor Environment Department, 1 Cyclotron Road, MS 70-108B, Berkeley, CA 94720, USA;5. Civil and Environmental Engineering Department, University of California, Berkeley, CA 94720, USA;1. Departamento de Genética, Escola Superior de Agricultura “Luiz de Queiroz”/Universidade de São Paulo (Esalq/USP), 13418-900, Piracicaba, SP, Brazil;2. Departamento de Produção Vegetal, Escola Superior de Agricultura “Luiz de Queiroz”/Universidade de São Paulo (Esalq/USP), 13418-900, Piracicaba, SP, Brazil;3. Divisão Produtividade Agroindustrial e Alimentos, Centro de Energia Nuclear na Agricultura/Universidade de São Paulo (Cena/USP), Av. Centenário, 303, São Dimas, 13416-000, Piracicaba, SP, Brazil;4. Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, 3590, Diepenbeek, Belgium |
| |
| Abstract: | Five polycyclic aromatic hydrocarbons (PAH), pyrene (PY), fluoranthene (FL), benz(a)anthracene (BaA), benzo(a)pyrene (BaP), and benzo(e)pyrene (BeP) adsorbed on glass fiber (GF) and Teflon impregnated glass fiber (TIGF) filters and on ambient particulate organic matter (POM) were exposed to ozone (50–300 ppb) passively in a 360-liter Teflon chamber and actively in a flow system. The influence of ozone concentration, exposure time and relative humidity (RH) on the degree of degradation of these PAH was established. The most reactive PAH both on filters and in ambient POM were PY, BaA and BaP. Up to 50–80% of these PAH degraded in 3-hr exposures to 200 ppb of ozone at ∼1% RH; in a flow system, most of the degradation occurred within the first 10 minutes of exposure. With the exception of BaP, the degradation of the PAH tested on GF and TIGF filters were much lower at 50% RH than at 1% RH, whether they were exposed to ozone in an active or passive mode. Interestingly, RH did not significantly affect the reactivity of PAH present in ambient POM passively exposed to ozone. Our results show that PAH are susceptible to ozone degradation under many typical atmospheric conditions. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
