Abstract
Cellulose filters impregnated with NaCl will collect nitric acid vapor from ambient atmospheres at efficiencies of ~95% when placed downstream from pretreated quartz particle filters in a high-volume sampler. No adsorption of NO 2 on the NaCl filters with retention as nitrate was observed. Conversion of NO 2 to nitrate on quartz (either retained as nitrate or released as artifact nitric acid) was negligibly low with the removal of the less than 1% of the incident NO 2. At high humidities adsorption of HNO 3 on the quartz prefilter can become significant Quartz filters which were preloaded with ambient particulate matter lost nitrate when exposed to aerosol H 2SO 4. Sulfur dioxide may be collected on potassium-carbonate-impregnated cellulose filters placed downstream from quartz and NaCl papers without any loss on the preceding filters. Ammonium nitrate on quartz filters is partially volatilized during ambient air sampling.
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