Chemical Compositions and Source Analysis of Atmospheric PM2.5 during Summer in Taian
Carbon components,water-soluble ions and their gaseous precursors in atmospheric PM2.5 in Taian were monitored online from May 10 to June 10,2019. The mass concentration and component composition of PM2.5 (carbonaceous species and water-soluble ions) were analyzed. The results showed that the average mass concentration of PM2.5 was 37.7 μg/m3 during the sampling period,which was 1.1 times higher than the standardary limit (35 μg/m3) regulated by of Chinese Ambient air quality standards (GB 3095–2012). For instance,the content of water-soluble ions in PM2.5 was the highest with 47.3％. The water-soluble components of PM2.5 and gaseous precursors had obvious diurnal variation,with a peak (single peak) at 7:00 am. OC/EC ratio of Taian in summer ranged from 1.1 to 17.5,indicated that Taian was mainly affected by a mixture of biomass combustion,coal combustion and exhaust emissions. Positive matrix factor analysis (PMF) showed that the proportion of secondary nitrate,biomass combustion source,secondary sulfate and coal combustion soure in PM2.5 were 22.0％,46.7％,29.9％ and 1.4％,respectively.
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