Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
582263 | Journal of Hazardous Materials | 2009 | 6 Pages |
Abstract
Agricultural waste burning is performed after harvest periods in June and November in Taiwan. Typically, farmers use open burning to dispose of excess rice straw. PM2.5 and PM2.5-10 measurements were conducted at National Chung Hsing University in Taichung City using a dichotomous sampler. The sampling times were during straw burning periods after rice harvest during 2002-2005. Ionic species including SO42â, NO3â, NH4+, K+, Ca2+, Clâ and Na+ and carbonaceous species (EC and OC) in PM2.5 and PM2.5-10 were analyzed. The results showed that the average PM2.5 and PM2.5-10 concentrations were 123.6 and 31.5 μg mâ3 during agricultural waste burning periods and 32.6 and 21.4 μg mâ3 during non-waste burning periods, respectively. The fine aerosol ionic species including Clâ, K+ and NO3â increased 11.0, 6.7 and 5.5 times during agricultural burning periods compared with periods when agricultural waste burning is not performed. K+ was found mainly in the fine mode during agricultural burning. High nitrogen oxidation ratio was found during agricultural waste burning periods which might be caused by the conversion of Nitrogen dioxide (NO2) to NO3â. It is concluded that agricultural waste burning with low dispersion often causes high PM2.5 and gases pollutant events.
Related Topics
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Authors
Man-Ting Cheng, Chuen-Liang Horng, Yi-Ru Su, Li-Kai Lin, Yu-Chi Lin, Charles C.-K. Chou,