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This article in JEQ

  1. Vol. 2 No. 2, p. 259-264
     
    Received: Apr 24, 1972
    Published: Apr, 1973


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doi:10.2134/jeq1973.00472425000200020019x

Removal of Ozone by Soil1

  1. Neil C. Turner,
  2. Saul Rich and
  3. Paul E. Waggoner2

Abstract

Abstract

Simultaneous measurements of the vertical profiles of horizontal wind, temperature, and ozone concentration above a bare, freshly cultivated fine sandy loam were obtained on 12 occasions during a 4-day period in July when ozone concentrations ranged from 8 to 26 × 1011 molecules (mol) cm−3 (1 × 1011 mol cm−3 = 4 ppb = 8 µg m−3). The decrease in ozone near the soil surface clearly indicated that the soil was removing ozone from the atmosphere. The rate of ozone removal varied from 3 to 12 × 1011 mol cm−2 sec−1. The flux into the soil varied with the concentration of ozone in the air, and indicated a resistance of about 2 sec cm−1 to ozone removal by the soil and the 2.5-cm air layer immediately above the soil. The rapid removal of ozone by soil in a ventilated chamber suggested a small resistance in the soil alone. A sample of soil containing 14% moisture had a resistance of 0.37 sec cm−1 to ozone removal, which was 0.23 sec cm−1 greater than that of activated charcoal, a strong adsorbing agent. Compaction and additional soil moisture increased the resistance to ozone removal, whereas autoclaving decreased the resistance.

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