济南春季大气PM2.5水溶性组分的半连续在线观测

利用大气细颗粒物(PM2.5)水溶性组分在线分析系统连续监测了2008年3~4月济南市PM2.5水溶性组分的浓度变化,并结合气溶胶部分前体物SO2、NO2、O3等的浓度数据和部分气象资料对监测数据进行了分析.结果表明,SO42-、NO3-和NH4+是PM2.5中水溶性离子的主要成分,分别占总水溶性组分的61.1%、13.4%和16.7%,且PM2.5中总水溶性组分的浓度,特别是SO42-的浓度,明显高于国内其他城市.温度、太阳辐射强度、混合层高度和风速等气象因素对总水溶性离子的浓度变化有重要影响.SO42-浓度白天明显高于夜间,而NO3-和NH4+的浓度昼夜变化幅度较小.SO42-和NO3-主要由SO2和NO2转化而来.后推气流轨迹分析表明,来自东北绕行西南方向和东北方向的混合气团结合济南的特殊地形及局地排放的污染物会加重济南春季PM2.5的污染.

Semi-continuous analysis on the water-soluble inorganic ions of PM_(2.5) in spring in Jinan City

A semi-continuous measurement(ambient ions monitor) of water soluble ions in PM2.5 in Jinan was conducted from 31 March to 19 April,2008.SO2,NO2,O3,and meteorological parameters were also monitored.SO42-,NO3-,and NH4+ were the dominant water-soluble fractions,and their proportions were 61.1%,13.4% and 16.7%,respectively.Compared with other cities in China,concentrations of water-soluble ions,especially SO42-,were much higher in Jinan in spring.The concentrations of sulfates exhibited a diurnal variation tha...