Response of KI Oxidant Analyzer for Peroxyacetyl Nitrate.

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Peroxyacetyl Nitrate (PAN) is the principal member of a family of nitrogenous compounds produced in polluted atmospheres by the action of sunlight on hydrocarbons and oxides of nitrogen. It is also important as a reservoir of oxides of nitrogen. It has been reported that a KI oxidant analyzer responds to PAN. However, quantitative studies of the sensitivity of the oxidant analyzer to PAN have not been well accomplished, especially for the standard method issued by Japan Environmental Agency, because of its thermochemical instability and difficulty of preparing standard sample gas of exact concentration.<BR>In our study, we synthesized PAN authentically by the reaction of peroxyacetic acid with sodium nitrate using various alkanes as solvent and analyzed with ECD/gas chromatography. We found that n-pentane was the most suitable solvent in preparation and purification of PAN. Further, we prepared the standard samples of PAN at various concentrations and they were subjected to the measurement by the oxidant analyzer to examine the response of the analyzer to PAN. The concentration of PAN in the sample gas was determined by the infrared absorption spectrum of PAN using known absorptivity at its absorption bands. As a result we find that the sensitivity of the oxidant analyzer for PAN is 6.7 ± 0.5%.
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