JEQ Journal of Natural Resources and Life Sciences Education
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Published in J Environ Qual 2:259-264 (1973)
© 1973 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Removal of Ozone by Soil1

Neil C. Turner, Saul Rich and Paul E. Waggoner2

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 x 1011 molecules (mol) cm–3 (1 x 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 x 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.

Key Words: resistance to ozone removal

NOTES

1 Contribution from the Departments of Ecology and Plant Pathology. The Connecticut Agr. Exp. Sta., P. O. Box 1106, New Haven. 06504.

2 Assistant Plant Physiologist, Chief Pathologist, and Director, respectively.

Received for publication April 24, 1972.




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The SCI Journals Agronomy Journal Crop Science
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Copyright © 1973 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.