Gas/particle partitioning of atmospheric PCDD/Fs in a satellite town in Eastern China

Meng xia Xu, Jian hua Yan, Sheng yong Lu, Xiao dong Li, Tong Chen, Ming jiang Ni, Hui fen Dai, Fei Wang, Ke fa Cen

Research output: Journal PublicationArticlepeer-review

24 Citations (Scopus)

Abstract

Gas/particle partitioning of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in ambient air was investigated in a satellite town in Eastern China from April 2007 to January 2008 comprehending large temperature variations (from 3 to 34 °C, daily average). Molecular weight, molecular structure and ambient temperatures are the three major factors that govern the gas/particle partitioning of atmospheric PCDD/Fs throughout the year. Generally, good agreements were obtained (except for winter) between measured particulate fractions and theoretical estimates of both the Junge-Pankow adsorption model and Harner Bidleman absorption model using different sets of subcooled liquid vapor pressure (PLo) and octanol-air partition coefficient (Koa), respectively. Models utilizing PLo estimates, derived from gas chromatographic retention indices (GC-RIs), are more accurate than that of entropy-based. Moreover, during winter, the Koa-based model using the GC-RIs approach performs better on lower chlorinated PCDD/Fs than that of PLo-based. Furthermore, possible sources of mismatch between measured and predicted values in winter (3-7 °C) were discussed. Gas adsorption artifact was demonstrated to be of minor importance for the phenomena observed. On the other hand, large deviations of slopes (mr) and intercepts (br) in log Kp vs. log PLo (Pa) / log Koa plots from theoretical values are observed in the literature data and these are found to be linearly correlated with ambient temperatures (P < 0.001) in this study. This indicates that the non-equilibrium partitioning of PCDD/Fs in winter may be significantly influenced by the colder temperatures that may have slowed down the exchange between gaseous and particulate fractions.

Original languageEnglish
Pages (from-to)1540-1549
Number of pages10
JournalChemosphere
Volume76
Issue number11
DOIs
Publication statusPublished - Sep 2009
Externally publishedYes

Keywords

  • Ambient air
  • Gas adsorption artifact
  • Gas/particle partitioning
  • Junge-Pankow adsorption model
  • K absorption model
  • PCDD/Fs

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry (all)
  • Pollution
  • Health, Toxicology and Mutagenesis

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