Development of a method for the sampling and analysis of sulfur dioxide and nitrogen dioxide from ambient air

A method has been developed to permit the simultaneous sampling of SO{sub 2} and NO{sub 2} from ambient air. Sulfur dioxide and NO{sub 2} are collected on triethanolamine-impregnated glass fiber filters. After sampling, the filters are extracted, and the extract is analyzed for sulfate, nitrite, and nitrate using ion chromatography. Ambient concentrations are computed from the recovered nitrogen and sulfur and the sampled air volume. Laboratory tests were conducted to evaluate the performance of the method under various species concentrations and loadings, sampling rates, humidities, temperatures, flushing conditions, and interferences. Results of these tests are described. Field measurements using the developed method compared favorably with other established methods. On the basis of the precision of field blanks, SO{sub 2} and NO{sub 2} detection limits of 0.3 and 0.2 ppb for 24-h samples and 0.04 and 0.03 ppb for 7-day samples were estimated. Precision estimates of better than {plus minus}15% were found, and accuracy within {plus minus}10% was observed.

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