Abstract
A study of acidic sulfate aerosol was conducted at two sites (8 km apart) along Chesnut Ridge in western Pennsylvania during November 1987. Fine (<2.5 μmad) aerosol composition was measured using dichotomous samplers with Teflon membrane filters. Three 8-h samples per day were collected for 10 days. The major species were SO 4 2− and NH 4 +, which averaged about 95 and 70 neq m −3, respectively, at both sites. The particulate acidity was less than 15 per cent of sulfate equivalents; the averages were 6–14 neq m −3 (<1.0 μg m −3 as H 2SO 4). Acidity exceeded this level only 30% of the sampling intervals at one site, with the peak value ≈ 50 neq m −3. This site received a higher frequency of upper level winds from the direction of several nearby coal-fired power plants (the nearest 5 km away), and the period of highest acidity was observed concurrently with elevated SO 2. The 3 × daily data suggest that higher acidity occurred in the overnight period (midnight to 8 a.m.) in the late fall, while sulfate had its highest levels in the morning to afternoon period.
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