Journal of Atmospheric Chemistry

, Volume 5, Issue 4, pp 373–383 | Cite as

Oxidation of sulfur dioxide by ozone in highly dispersed water droplets

  • T. M. Nahir
  • G. A. Dawson


The oxidation of S(IV) by ozone in aqueous solution has been studied in highly dispersed droplets in a laboratory could chamber at 20°C. Urban air was used. Ozone concentrations ranged from 15 to 120 ppb, orders of magnitude lower than most previous works. Rate constants were derived from differential product determination, rather than from rates of decay of bulk reactants. Comparison of the results obtained here with those from previous work indicates that the reaction rate is indeed first order with respect to ozone. The second-order reaction rate constants found in this work lay between, or close to, other recent results, and could be represented by:k=1.23×104 [H+]−0.51 M−1 s−1.

Key words

Chemistry of cloud drops aqueous oxidation of sulfur dioxide by ozone 


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Copyright information

© D. Reidel Publishing Company 1987

Authors and Affiliations

  • T. M. Nahir
    • 1
  • G. A. Dawson
    • 1
  1. 1.Institute of Atmospheric PhysicsThe University of ArizonaTucsonU.S.A.

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