有机酸对长江三角洲大气背景区降水酸化的影响

为了揭示有机酸对长江三角洲区域降水酸化的影响,2008年在浙江临安区域大气本底站采集了35场降水的样本,用离子色谱梯度淋洗方法测定有机酸浓度.结果表明,甲酸、乙酸、甲磺酸、乙二酸、丙二酸、丁二酸、戊二酸均有不同程度检出,一元有机酸中甲酸和乙酸在每场降水中均有检出;二元有机酸中,乙二酸和丁二酸检出率很高,其他有机酸检出率较低.甲酸、乙酸和乙二酸约占检测到的总有机酸的89%,其中甲酸和乙酸占总有机酸的80%,约占阴离子总量的13%;甲酸、乙酸、总有机酸的浓度及其在阴离子总量中所占比例都远高于我国北京、深圳等城市,有机酸对长江三角洲大气背景区降水化学的影响比城市地区显著.另外,生长季节降水中有机酸浓度高于非生长季节,表明植被排放的有机酸是长江三角洲大气背景区降水中有机酸的重要来源.

Impact of organic acids on rainwater acidification in the background air of the Yangtze River Delta

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 t...