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Sorption of Sulfur Dioxide by Calcareous Soils¹

ABSTRACT

The capacities and rates of calcareous soils to sorb SO₂ were measured by a steady-state method in which a stream of air plus SO₂ passed rapidly through the soil. At room temperature, air-dry calcareous soils were saturated with SO₂ within 10 to 15 min from a dry gas stream. The sorption capacities, 0.4 to 1.6 g of S/100 g of soil at 0.34% SO₂ in air, increased with SO₂ concentration and specific surface of the soils. Moisture in the air and/or soils increased the SO₂ sorption capacities to 0.8 to 6.4 g of S/100 g, approximately equivalent to the acid-titratable basicities, but saturation required several hours. The initial sorption rate ranged from 0.06 to 0.29% S/min in the moist soils.

¹ Contribution from the Dep. of Soils, Water and Engineering, The University of Arizona, Tucson, 85721. Supported in part by Rockefeller Foundation Grant 70073.

² Graduate Assistant, Professor, and Postdoctoral Research Associate, respectively.

Received for publication October 4, 1973. Accepted for publication November 12, 1974.