The filter paper method for measuring sulfur oxides, nitrogen dioxide and chloride in atmosphere

Abstract

The lead peroxide method has been widely applied for measuring the extent of atmospheric pollution by sulfur oxides. But, it is time-consuming for analyses and subjected to deviations of results by the differences of the quality of lead peroxide.
The filter paper method is not affected by the difference of the quality of reagent, and can be used not only for the determination of sulfur oxides but also for the determination of nitrogen oxides and chloride in the atmosphere.
The tast papers are prepared by immersing filter papers (Toyo roshi Co. Ltd. No. 526, 5×13 cm) into a 50% potassium carbonate solution followed by air-drying.
They are exposed to the atmosphere for the period of one month in louvered boxes. After the test period has elapsed the paper space of 5×10 cm is cut into small pieces and treated with water for the extraction.
Sulfur oxides, nitrogen oxides and chloride are determined, respectively, by the barium chloranilate method, the diazotizing method and the mercury chloranilate method.