کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4429390 1619823 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
PCBs, PBDEs, and PAHs in Toronto air: Spatial and seasonal trends and implications for contaminant transport
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
PCBs, PBDEs, and PAHs in Toronto air: Spatial and seasonal trends and implications for contaminant transport
چکیده انگلیسی

The distributions of polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs), and polycyclic aromatic hydrocarbons (PAHs) in the atmosphere of Toronto, Canada and the surrounding suburban/rural area were examined. A series of temporally- and spatially-distributed air samples was collected over a 1-year period with a high-volume active air sampler at one downtown site and polyurethane foam passive air samplers at 19 sites. Passive sampler air concentrations of ΣPAHs ranged from 0.27 to 51 ng/m3. Concentrations of ΣPCBs ranged from 6.0 to 1300 pg/m3, and concentrations of ΣPBDEs ranged from 0.47 to 110 pg/m3. All compounds exhibited the highest concentrations in the urban core, and lowest concentrations in the surrounding rural areas, however the exact ratio depended on location since concentrations varied considerably within the city. Results from the application of a radial dilution model highlighted the influence of the central business district (CBD) of the city as a source of contaminants to the surrounding environment, however the radial dilution comparison also demonstrated that sources outside the CBD have a significant influence on regional contaminant concentrations.A strong relationship between temperature and partial pressure of the gas-phase PCBs, low molecular weight PBDEs and less-reactive PAHs suggested that their dominant emissions originated from temperature-controlled processes such as volatilization from local sources of PCBs, PAHs and PBDEs at warm temperatures, condensation and deposition of emissions at cold temperatures, and ventilation of indoor air with elevated concentrations. The relationship between temperature and atmospheric PAH concentrations varied along the urban–rural gradient, which suggested that in highly urbanized areas, such as downtown Toronto, temperature-related processes have a significant impact on air concentrations, whereas winter emissions from domestic heating have a greater influence in areas with less impervious surface coverage.


► Air concentrations of PCBs, PBDEs, and PAHs measured at urban/suburban/rural sites.
► Significant intra-urban variability exists within the urban area.
► Temperature trends of PAHs in air differ between urban and rural areas.
► Radial dilution model used to estimate movement of SVOCs from urban area.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volume 429, 1 July 2012, Pages 272–280
نویسندگان
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