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Polycyclic aromatic hydrocarbons in dustfall in Tianjin, China
1College of Environmental Sciences, Peking University, Beijing 100871, PR China.
The Science of the Total Environment
|May 28, 2005
Summary
Atmospheric dustfall in Tianjin showed higher polycyclic aromatic hydrocarbon (PAH) levels during the heating season, with industrial areas experiencing greater PAH deposition. Domestic heating
Area of Science:
- Environmental Science
- Atmospheric Chemistry
- Pollution Studies
Background:
- Polycyclic Aromatic Hydrocarbons (PAHs) are persistent organic pollutants with significant environmental and health impacts.
- Atmospheric dustfall is a key pathway for PAH deposition in urban and industrial environments.
- Understanding seasonal variations and sources of PAHs is crucial for effective pollution control.
Purpose of the Study:
- To analyze the concentrations and composition of 16 priority PAHs in atmospheric dustfall in Tianjin, China.
- To investigate seasonal differences in PAH levels and molecular distribution.
- To assess the deposition fluxes and identify areas with higher PAH contamination.
Main Methods:
- Collection of atmospheric dustfall samples from 23 locations over one year (March 2002-March 2003).
- Analysis of 16 EPA-priority PAHs using gas chromatography-mass spectrometry.
- Calculation of PAH concentrations, seasonal variations, molecular indices, and deposition fluxes.
Main Results:
- SigmaPAH16 concentrations were significantly higher during the heating season (2.5–85.5 µg/g) than the non-heating season (1.0–48.2 µg/g).
- High-molecular-weight PAHs predominated in the heating season, except in the east industrial area.
- Annual deposition fluxes for sigmaPAH15, sigmaPAH6, and benzo[a]pyrene were estimated at 1911, 196, and 53 µg/m²/year, respectively, with higher rates in the industrial zone.
Conclusions:
- The heating season significantly increases PAH levels in atmospheric dustfall in Tianjin.
- Industrial areas exhibit distinct PAH profiles and higher deposition rates, indicating localized pollution sources.
- While domestic heating contributes, its seasonal impact on annual PAH deposition is not dominant, suggesting other sources are more significant overall.