春季沙尘过程对华东高山背景区域颗粒物中水溶性无机离子的影响

于2014年3—5月在国家大气背景监测福建武夷山站采集了PM2.5及PM2.5~10样品,利用离子色谱对其中的水溶性组分进行分析,并同步收集气象因子及污染物质量浓度数据,结合后向气流轨迹,分离出受沙尘影响的样品,探讨了春季沙尘过程华东高山背景区域颗粒物中水溶性组分的特征.结果表明,春季武夷山背景点沙尘影响期间颗粒物质量浓度及各水溶性离子浓度均比非沙尘期高,在粗粒子中表现更为明显;沙尘期间NO-3在粗粒子中明显富集,NO-3浓度显著升高;受沙尘影响,粗粒子中阳离子与阴离子的当量浓度比及NO2的二次转化率均明显升高.

Characteristics of water-soluble inorganic ions in particulate matter at mountain background region of East China during dust storm event

PM_2.5 and PM_2.5~10 samples were collected during March to May 2014 at Wuyishan, a national atmospheric background monitoring station in Fujian Province. Water-soluble inorganic ions in PM_2.5 and PM_2.5~10 were determined by ion chromatography. Meteorological parameters, trace gases, and PM₁₀ and PM_2.5 mass concentrations were also recorded. The results showed that the levels of PM and ions, especially in the coarse particle mode, were much higher during the dust storm event. In particular, nitrate concentrations increased more significantly than other ions during the dust storm event. The cation/anion ratios and NOR also increased significantly during the dust storm event.