Atmospheric distribution of polycyclic aromatic hydrocarbons and deposition to Galveston Bay,Texas, USA |
| |
| Institution: | 1. Key Lab of Medical Protection for Electromagnetic Radiation, Ministry of Education of China, Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Gaotanyan St 30, Chongqing 400038, China;2. Chongqing Institute of Science and Technology for Population and Family Planning, Yangheercun 5, Chongqing 401147, China;3. National Institute of Measurement and Testing Technology, Yushuang St 10, Chengdu, Sichuan 610021, China;4. Department of Environmental Health, College of Preventive Medicine, Third Military Medical University, Gaotanyan St 30, Chongqing 400038, China;1. Research Centre for Toxic Compounds in the Environment (RECETOX), Masaryk University, Brno 62500, Czech Republic;2. Mu Gamma Consultants Pvt. Ltd., Sector-50, Gurgaon, Haryana 122018, India;3. The Energy and Resources Institute (TERI), Darbari Seth Block, India Habitat Centre, Lodhi Road, New Delhi 110003, India;4. Norwegian Institute for Water Research (NIVA), Gaustadalleen 21, Oslo 0349, Norway |
| |
| Abstract: | Estimates of the atmospheric deposition to Galveston Bay of polycyclic aromatic hydrocarbons (PAHs) are made using precipitation and meteorological data that were collected continuously from 2 February 1995 to 6 August 1996 at Seabrook, TX, USA. Particulate and vapor phase PAHs in ambient air and particulate and dissolved phases in rain samples were collected and analyzed. More than 95% of atmospheric PAHs were in the vapor phase and about 73% of PAHs in the rain were in the dissolved phase. Phenanthrene and napthalene were the dominant compounds in air vapor and rain dissolved phases, respectively, while 5 and 6 ring PAH were predominant in the particulate phase of both air and rain samples. Total PAH concentrations ranged from 4 to 161 ng m?3 in air samples and from 50 to 312 ng l?1 in rain samples. Temporal variability in total PAH air concentrations were observed, with lower concentrations in the spring and fall (4–34 ng m ?3) compared to the summer and winter (37–161 ng m?3). PAHs in the air near Galveston Bay are derived from both combustion and petroleum vaporization. Gas exchange from the atmosphere to the surface water is estimated to be the major deposition process for PAHs (1211 μg m? 2 yr? 1), relative to wet deposition (130 μg m?2 yr? 1) and dry deposition (99 μg m?2 yr? 1). Annual deposition of PAHs directly to Galveston Bay from the atmosphere is estimated as 2 t yr?1. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
