A new passive colorimetric air monitoring badge system for ammonia, sulfur dioxide and nitrogen dioxide

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Abstract
A new passive colorimetric air monitoring badge system has been developed to determine the time-weighted average (TWA) concentration of specific inorganic vapor contaminants in air. The system consists of a small passive badge which either can be worn by employees for personal monitoring or used as an area monitor and a portable colorimetric readout instrument which determines the exposure dose in ppm-hours. To date, systems have been developed for ammonia, sulfur dioxide, and nitrogen dioxide, and they will meet or exceed both NIOSH and OSH A accuracy requirements. The overall performance of these systems, based on laboratory tests designed to show overall accuracy, linearity, and environmental effects, is described. Field test results are also presented.

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