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Potential trace metal-organic complexation in the atmosphere.

Hiroshi Okochi1, Peter Brimblecombe

  • 1School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK. ookouh01@kanagawa-u.ac.jp

Thescientificworldjournal
|June 14, 2003
PubMed
Summary

Metal-organic complexation can increase the uptake of certain atmospheric gases into aerosols. Alpha-dicarbonyls like glyoxal show significant partitioning enhancement, unlike dicarboxylic acids.

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Area of Science:

  • Atmospheric Chemistry
  • Environmental Science
  • Geochemistry

Background:

  • Metal-organic complexation may enhance the solubility and uptake of gaseous organic compounds in atmospheric water and aerosols.
  • Understanding these interactions is crucial for atmospheric modeling and air quality assessments.

Purpose of the Study:

  • Investigate potential atmospheric organic ligands and their complexation with metals.
  • Determine the enhanced uptake of various organic acids and dicarbonyls into atmospheric aqueous aerosol.
  • Evaluate the impact of metal complexation on the gas-aqueous phase partitioning of atmospheric ligands.

Main Methods:

  • Literature review of available references.
  • Experimental data analysis.
  • Simple equilibrium model calculations to assess gas-aqueous phase partitioning.

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Main Results:

  • Humic-like substances are probable ligands, though poorly characterized.
  • Polycarboxylic acids and hydroxy forms (e.g., citric acid) effectively complex metals like copper.
  • Complexation has minimal impact on high Henry's Law constant ligands (e.g., oxalic acid).
  • Lower Henry's Law constant alpha-dicarbonyls (e.g., glyoxal) show potential for significant aqueous phase partitioning via complexation.
  • Experimental data showed no copper complexation with alpha-dicarbonyls (glyoxal, methylglyoxal).
  • Beta-dicarbonyls like malondialdehyde may partition into atmospheric water via metal complexation.

Conclusions:

  • Metal-organic complexation significantly influences the atmospheric partitioning of specific organic compounds, particularly alpha-dicarbonyls.
  • While humic-like substances are likely ligands, their characterization remains a challenge.
  • The findings highlight the complex role of metal-organic interactions in atmospheric processes.