A Versatile Electrochemical Monitor for Air-Quality Measurements

An electrochemical instrument of the type commonly used to monitor total oxidants was adapted to measure acid gases such as SO2, HCI, and HCO2H. By using chemical methods of treating the air sample prior to absorption, it is possible to monitor for specific oxidants and acids. Measurements of NO, NOx, and SO2 during smog-chamber experiments were found to be in good agreement with measurements made by other methods.