A Versatile Electrochemical Monitor for Air-Quality Measurements

Abstract

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, NO_x, and SO₂ during smog-chamber experiments were found to be in good agreement with measurements made by other methods.