Journal of Atmospheric Chemistry

, Volume 12, Issue 2, pp 169–180 | Cite as

Henry's law constant and hydrolysis of peroxyacetyl nitrate (PAN)

  • Jost Kames
  • Silke Schweighoefer
  • Ulrich Schurath


The effect of temperature on the solubility of PAN and on its hydrolysis rate in near-neutral and slightly acidic water were studied in a bubble column apparatus. The results obtained are a Henry's law coefficient H=10−9.04±0.6 exp[(6513±376)/T] M atm−1, and a first-order hydrolysis rate constant k=106.60±1.0 exp[(−6612±662)/T] s-1, which was independent of pH in the range 3.2≤pH≤6.7. The products formed are nitrite and nitrate in approximately equal proportions under near-neutral conditions. At a pH<4, nitrite is oxidized in a secondary reaction, and nitrate becomes the only product at low pH. Previously measured deposition velocities of PAN on stagnant water surfaces are shown to be hydrolysis rate limited.

Key words

Peroxyacetyl nitrate (PAN) solubility hydrolysis 


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Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • Jost Kames
    • 1
  • Silke Schweighoefer
    • 1
  • Ulrich Schurath
    • 1
  1. 1.Institut für Physikalische Chemie der Universität BonnBonn 1F.R.G.

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