Temperature dependence of gas-phase polycyclic aromatic hydrocarbon and organochlorine pesticide concentrations in Chicago air


Sofuoglu A., Odabasi M., Tasdemir Y. , Khalili N., Holsen T.

ATMOSPHERIC ENVIRONMENT, vol.35, no.36, pp.6503-6510, 2001 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 35 Issue: 36
  • Publication Date: 2001
  • Doi Number: 10.1016/s1352-2310(01)00408-3
  • Title of Journal : ATMOSPHERIC ENVIRONMENT
  • Page Numbers: pp.6503-6510
  • Keywords: polycyclic aromatic hydrocarbons, organochlorine pesticides, air/surface exchanged, temperature dependence, SEMIVOLATILE ORGANIC-COMPOUNDS, LAKE-MICHIGAN, POLYCHLORINATED-BIPHENYLS, GREAT-LAKES, ATMOSPHERIC CONCENTRATIONS, COASTAL ATMOSPHERE, TEMPORAL TRENDS, DRY DEPOSITION, PAHS, UK

Abstract

The temperature dependence of gas-phase atmospheric concentrations of polycyclic aromatic hydrocarbons (PAHs) and organochlorine pesticides measured in Chicago, IL between June and October 1995 were investigated using plots of the natural logarithm of partial pressures (in P) vs. reciprocal mean temperatures (1/T). For the eight lowest molecular weight PAHs, temperature dependence was statistically significant (at the 95% confidence level) and temperature accounted for 23-49% of the variability in gas-phase concentrations. The relatively higher slopes for most of the PAHs suggested that volatilization from local sources and short-range transport influenced their concentrations, For pesticides, temperature dependence was statistically significant for DDD and for trans-nonachlor (at the 95% and 90% confidence levels), and was not statistically significant for the other five compounds (2-18% of the variability in their gas-phase concentrations). The relatively lower slopes for individual pesticides suggested that they have mostly non-urban and distant sources.