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Organic atmospheric particulate material.

John H Seinfeld1, James F Pankow

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA. seinfeld@caltech.edu

Annual Review of Physical Chemistry
|January 14, 2003
PubMed
Summary
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Secondary organic particulate matter (PM) forms from oxidized volatile organic compounds. This study outlines secondary organic PM formation theory, including water's role and experimental findings.

Area of Science:

  • Atmospheric Chemistry
  • Environmental Science
  • Chemical Engineering

Background:

  • Carbonaceous compounds are a major component of atmospheric particulate matter (PM).
  • Particulate organic material originates from direct emissions or atmospheric oxidation of volatile organic compounds (VOCs).
  • Oxidation of VOCs, incorporating oxygen and/or nitrogen, reduces molecular volatility, leading to secondary PM formation.

Purpose of the Study:

  • To outline the theory of secondary organic particulate matter (PM) formation.
  • To elucidate the role of water in secondary organic PM formation.
  • To summarize experimental studies on secondary organic PM formation and its molecular products.

Main Methods:

  • Theoretical framework for secondary organic PM formation.

Related Experiment Videos

  • Review of experimental data on secondary organic PM.
  • Analysis of molecular products from VOC oxidation.

    • Main Results:

    • Secondary organic PM formation is often quantified using fractional mass yield.
    • Water plays a significant, ubiquitous role in the atmospheric formation of secondary organic PM.
    • Experimental studies provide insights into the molecular composition of secondary organic PM.

    Conclusions:

    • Understanding secondary organic PM formation is crucial for atmospheric particulate matter research.
    • The process involves the transformation of volatile organic compounds into less volatile, particulate forms.
    • Further experimental investigation is needed to fully characterize secondary organic PM and its atmospheric impact.