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《Acta Scientiae Circumstantiae》 2007-03
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On-line analysis the water-soluble chemical of PM_(2.5) in late summer and early autumn in Beijing

ZHANG Kai,WANG Yuesi*,WEN Tianxue,LIU Guangren, XU HonghuiLAPC, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing 100029  
The concentration of water-soluble chemical in PM2.5 and the mass concentration of PM2.5 during 19 August to 15 September in Beijing was analyzed by using the system of rapid collection of fine particles and RP1400a, and at the same time, the meteorological data and SO2, NOx data were also analyzed. The results showed that the average concentration of PM2.5 was (61.0±30.6)μg·m-3 in the good air quality period , and the proportion of water-soluble chemical in PM2.5 was 40%~56%. Nitrite, nitrate, sulfate and ammonium were the dominant water-soluble chemical, constituting more than 80% of water-soluble chemical, and they appeared daily variation obviously. The ratio of SO2 to SO2-4 was higher than that of NOx to NO-2 and NO-3. The concentration of nitrite had relation with meteorological element and atmospheric chemistry reactions, and nitrite transformed into nitrate in daytime.
【Fund】: 国家自然科学基金项目(No.40525016);; 国家重点基础研究发展计划(973)项目(No.2007CB407300)~~
【CateGory Index】: X513
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