Abstract
SO 2 absorption by 2 mm dia. droplets of dilute heavy metal solutions (concentration 10 −6−10 −4 m) exposed to trace concentration of SO 2 in air (10–1000 ppb) was measured at 25 and 8°C. Manganese and iron ions were effective catalysts of SO 2 oxidation in acidic solutions but copper ions were not. Results indicate that the manganese ion Mn 2+ formed complexes [ Mn 2+( SO 3 2−) 3] −4 before taking part in the oxidation reaction. The rate of SO 2 absorption by a droplet of catalyst solution decreased with decreasing pH. Decreasing the temperature of a manganese solution from 25 to 8°C caused a five- to ten-fold decrease in SO 2 absorption rate. The addition of iron ions (Fe 2+ or Fe 3+) to solutions of Mn 2+ not only increased the rate of SO 2 oxidation but also reduced the dependence of absorption rate on temperature. A quantitative estimate of the rate of SO 2 removal by a typical urban cloud led to SO 2 removal rates between 0.08 and 2.0% h −1 depending on temperature and the heavy metal content of the cloud water.
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