A New Analytical Technique for Sulfur Dioxide in Air

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Abstract
An analytical system capable of recording continuously and practically instantaneously changes in sulfur dioxide concentration in air has been developed. The method requires a relatively small volume of gas sample for analysis. Contaminated air reacts with acidified hydrogen peroxide solution in a counter-current absorber to form sulfuric acid. The impedance of the effluent bears an inverse relationship to the amount of sulfur dioxide being absorbed ranging from 0-500 ppm. Changes in impedance are detected by two parallel electrodes when the predetermined, high frequency voltage across them is disturbed. The applicability of this technique for other gases and studies is discussed.