【作者】 李杏茹； 王英锋； 郭雪清； 王跃思；

【Author】 GUO Xueqing1,2,Wang Yingfeng1,LI Xingru1,2,WANG Yue-si2(1.Department of Chemistry,Capital Normal University,Beijing 100037,China;2.LAPC,Institute of Atmospheric Physics,Chinese Academy of Science,Beijing 100029,China)

【机构】 首都师范大学化学系分析测试中心； 中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室；

【摘要】 利用大流量颗粒物采样器分昼夜采集了2007年春节前后大气气溶胶中PM2.5样品,并采用气相色谱-质谱技术对PM2.5样品中的有机酸进行了检测和分析,春节前后一元脂肪酸的总浓度范围为120.3-765.6ngm-3,二元脂肪酸的浓度范围为35.3-141.9ngm-3,芳香酸的总浓度范围为16.6-67.5ngm-3,一元脂肪酸白天和夜间平均浓度相差不大;二元和芳香酸白天平均浓度要高于夜间,同时,所有有机酸在除夕前的平均浓度均高于除夕后。一元脂肪酸主要来源于人为排放,二元脂肪酸和芳香酸主要来源于某些烃类的二次转化。更多还原

【Abstract】 Research PM2.5 aerosols had been carried out with sampler of High-volume sampler during Spring Festival of 2007 in Beijing,and the concentrations of organic acids in PM2.5 samples were determined via GC-MS.The total concentrations of monocaiboxylic,dicarboxylic,and aromatic acids during Spring Festival were 120.3-765.6 ng m-3,35.3-141.9 ng m-3,and 16.6-67.5 ng m-3.The differences for monocarboxylic acids in day/night concentrations are not significant,while the concentrations of dicarboxylic and aromatic acids were higher in day time than that in night time.At the same time,we found that the total concentrations of all the organic acids were higher before the new year’s eve than those after the new year’s eve.Anthropogenic emissions were the main source of monocarboxylic acids,and photochemical oxidation of hydrocarbons were the main source of dicarboxylic and aromatic acids更多还原