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| Impact of organic acids on rainwater acidification in the background air of the Yangtze River Delta |
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Abstract ：In order to investigate the impact of organic acids on acid rain in the background region of the Yangtze River Delta, 35 rainwater samples were collected during 2008 in the Lin￠an Regional Background Air Station and analyzed for organic acids using ion chromatography. In result, formic, acetic, methanesulfonic, oxalic, malonic, succinic and glutaric acids were detected notably. Formic, acetic and oxalic acids were the most abundant organic acids, and the sum of their concentrations averagely accounted for 89% of the total detected organic acids and 13% of the total anions, respectively. Concentrations of formic and acetic acids, the total organic acids and their fractions in the total anions were much higher than those in the urban areas of Beijing and Shenzhen, which indicated that organic acids influenced more on rainwater acidification in the Yangtze River Delta. In the growing seasons, i.e., spring and summer, concentrations of organic acids were found significantly higher than those in the non-growing seasons, implying vegetation emissions are a potentially important source of organic acids in the rainwater.
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Received: 30 June 2009
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