广州秋季灰霾和正常天气PM_(2.5)中水溶性离子特征  

Chemical composition of water-soluble ions in PM_(2.5) between haze and normal days in autum in Guangzhou

作　　者：李淑贤[1,2] 邱洪斌[1] 王新明[2] 

机构地区：[1]佳木斯大学药学院,黑龙江佳木斯154007 [2]中国科学院广州地球化学研究所有机地球化学国家重点实验室,广东广州510640

出　　处：《分子科学学报》2011年第3期166-169,共4页Journal of Molecular Science

基　　金：国家自然科学基金资助项目(40821003);广东省-国家自然科学基金委员会联合基金资助项目(U0833003)

摘　　要：为了探讨细粒子(PM2.5)在灰霾天气下水溶性离子的组分特征,2007年秋季在广州万顷沙连续一个月采集了大气PM2.5样品,分析了SO42-,NO3-,NH4+,Cl-,Na+,K+,Ca2+,C2O42-,F-,NO2-和HCOO-11种水溶性离子含量.结果显示,正常天气和灰霾天气PM2.5总水性离子质量浓度分别为38.99和52.74μg/m3,灰霾和正常天气SO42-,NO3-和NH4+均为PM2.5的主要成分,灰霾天气时SO42-,NO3-和C2O42-占总水溶性离子的百分比显著提高,显示二次吸湿性组分在灰霾形成过程中的重要作用.正常天气和灰霾天气NO3-与SO42-的质量之比平均分别0.29(0.11～0.54)和0.39(0.28～0.62),表明燃煤对它们贡献较大,但灰霾NO3-升高幅度比SO42-相对较高.灰霾天气和正常天气PM2.5均为酸性,灰霾天气酸性更强.To compare the water-soluble chemical ions in fine particulates during haze days and normal days,PM2.5 samples were collected consecutively for a month in autumn in 2007 at Wanqingsha in Guangzhou.Eleven water-soluble ions（SO42-,NO3-,NH4＋,Cl-,Na＋,K＋,Ca2＋,C2O42-,F-,NO2-and HCOO-） were measured.The result showed that the mass concentration of total water soluble ions in PM2.5 during normal days and haze days are 38.99 and 52.74 μg/m3,respectively.SO42-,NO3-and NH4＋ are the major species both in normal and haze days.The percentage of SO42-and NO3-in PM2.5 during haze days is higher than that in normal days.The ratios of NO3-/SO42-in PM2.5 are 0.11～0.54 and 0.28～0.62 during normal and haze days,respectively,which indicats that the main contribution of SO2 and NOx is coal burning,rather than mobile source.The mobile sources have larger contribution to the SO2 and NOx during haze days than normal days.PM2.5 is acid during normal and haze days,but more acid in haze days than normal days.

关 键 词：细粒子(PM2.5) 水溶性离子 灰霾 粒子酸性 

分 类 号：O643[理学—物理化学]