Review on occurrence and behavior of PCDD/Fs and dl-PCBs in atmosphere of East Asia

Minh Man Trinh, Moo Been Chang

Research output: Contribution to journalReview articlepeer-review

20 Scopus citations

Abstract

This paper reviews the data from studies mainly published after 2000 to provide the current understanding of the physicochemical properties, atmospheric occurrence, gas/particle partitioning, fate and temporal trends in atmospheric matrix of PCDD/Fs and dl-PCBs of East Asia. Ambient PCDD/Fs and dl-PCBs concentrations in East Asia are found to be tens to hundreds times higher than that measured in Europe and North America. After strict regulations on PCDD/Fs and dl-PCBs emissions are enacted, the concentrations of these compounds decrease dramatically in Eastern Asian countries. In general, most of PCDD/Fs distribute in particle phase while dl-PCBs majorly exist in gas phase. Three main factors including physicochemical properties of the compounds, properties of particle and atmospheric condition affect the gas/particle partitioning of PCDD/Fs and dl-PCBs. The accuracy of absorption and adsorption models on predicting gas/particle partitioning of PCDD/Fs and dl-PCBs is evaluated. Gas-phase compounds are mostly removed from the atmosphere via reactions with OH radicals while those in particle phase are majorly removed by wet/dry deposition processes. The effects of removing processes and long-range transport on gas/particle partitioning are also discussed.

Original languageEnglish
Pages (from-to)23-36
Number of pages14
JournalAtmospheric Environment
Volume180
DOIs
StatePublished - May 2018

Keywords

  • Ambient air
  • Contents
  • Dioxin-like PCBs
  • East Asia
  • Occurrence
  • PCDD/Fs
  • Spatial/temporal trends

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