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南通市PM2.5中水溶性离子季节分布特征
蒋荣
江苏省南通环境监测中心
摘要:
利用南通市2016年12月-2018年10月大气多参数站自动监测的PM2.5数据和在线离子色谱分析仪Marga监测所得的大气 PM2.5中水溶性离子数据,分析了南通市大气污染季节分布特征。研究表明,南通市PM2.5和水溶性离子质量浓度为冬春季高、夏秋季低。春夏秋冬四季,水溶性离子占PM2.5质量百分比分别为68.2%、70.6%、64.5%、74.5%,其中二次离子SNA(NO3<sup>-</sup>、SO4<sup>2</sup><sup>-</sup>和NH4<sup>+</sup>)占PM2.5的质量百分比分别为63.1%、67.0%、59.3%、66.8%。NO3<sup>-</sup>/ SO4<sup>2</sup><sup>-</sup>的质量浓度比表明,移动源已成为南通市春、秋、冬季的主要污染源。四季均存在不同程度的二次转化,且SO2的转化率均大于NO2,NO2冬季转化率最大、夏季最小,SO2夏季转化率最大、秋季最小。南通市NO2转化为硝酸盐的液相非均相反应途径相对欠缺,若能找出其抑制因素,或可同时降低南通市O3和NO2污染。
关键词:  水溶性离子  PM2.5  二次转化  南通
DOI:
分类号:X5
基金项目:
Seasonal distribution characteristics of water-soluble ions in PM2.5 in Nantong
Abstract:
The seasonal distribution characteristics of atmospheric pollution in Nantong were analyzed based on the ion compositions monitored by Marga and PM2.5 measured by Nantong atmospheric multi-parameter automatic monitoring from December 2016 to October 2018. During the study period,the concentrations of PM2.5 and water-soluble ions in Nantong are higher in winter and spring and lower in summer and autumn. In the four seasons, water-soluble ions contributed S68.2%、70.6%、64.5%、74.5% of PM2.5(mass ratio) respectively, among which SNAS(NO3<sup>-</sup>、SO4<sup>2</sup><sup>-</sup>and NH4<sup>+</sup>) contributed 63.1%、67.0%、59.3%、66.8% respectively. The NO3<sup>-</sup>/SO4<sup>2</sup><sup>-</sup> ratio implied that mobile sourcehas become the main pollution source in spring, autumn and winter in Nantong. There are different degrees of secondary reactions in the four seasons, and the reaction ratio of SO2 is greater than that of NO2. The reaction ratio of NO2 is the highest in winter and the lowest in summer, and the reaction ratio of SO2 is the highest in summer and the lowest in autumn. It is speculated that the liquid phase heterogeneous reaction of NO2 into nitrate in Nantong is relatively deficient. If the inhibitory factors can be found, the pollution of O3 and NO2 in Nantong can be reduced simultaneously.
Key words:  water-soluble ions  PM2.5  secondary reaction  Nantong