Abstract
Abstract A new technique using a solid substance for the absorption of nitrogen oxides in the atmosphere was developed in order to obtain an average concentration of nitrogen oxides over a period of several weeks. Nitrogen oxides is absorbed by an absorbent (alkaline earth metal peroxide), and the nitrate produced in the absorber is extracted into water to determine the amount of nitrate by the ion-selective electrode method. The concentration of atmospheric nitrogen oxides is calculated from the amount of nitrate in the extract. A quantitative relation was found between the amount of nitrogen oxides collected on the absorber and that of nitrate in the extract. Hydrogen peroxide produced by the reaction of the absorber and water did not interfere with the measurement of nitrate by the ion-selective electrode technique. Practicability of this technique was demonstrated in comparison with the automatic recording analyzer (NOx meter) with the Saltzman reagent.
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