Abstract
Accurate, continuous measurements of ozone are extremely important in air pollution studies, since the oxidant level correlates with the degree of irritation, visibility and plant injury in Los Angeles-type smog. Although several instruments have been designed specifically for continuous ozone analysis, a single purpose instrument for each pollutant is expensive. A multi-purpose analyzer, capable of analyzing the atmosphere for a number of important contaminants, could reduce significantly the capital investment required by an air pollution group for numerous single-purpose instruments. Such an analyzer, potentially capable of analyzing and recording any reagent-soluble and -reactive pollutant for which a suitable colorimetric analytical methods exists, was developed. This analyzer, the Mini-Adak, comprises two functional parts: a recording, flow colorimeter, and an air-reagent contacting system. Because of the inherent versatility of the Mini-Adak analyzer and the stability and specificity of the sodium diphenyl-aminesulfonate ozone reagent, the simplicity of the phenolphthaline reagent, a study was undertaken to determine the suitability of these reagents for ozone analysis with a multi-purpose, automatic analyzer. This paper describes the use of NaDS and phenolphthalin in a Mini-Adak II analyzer. The response of the reagent to some interfering compounds is discussed and comparative laboratory data obtained with the neutral KImore » reagent are presented.« less
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