北京市PM_(2.5)二次水溶性无机离子变化特征  

VARIATION CHARACTERISTICS OF SECONDARY WATER-SOLUBLE INORGANIC IONS IN PM_(2.5) IN BEIJING

作　　者：王占山[1] 刘保献[1] 魏强[1] 李云婷[1] 景宽[1] 富佳明[1] 闫贺[1] 

机构地区：[1]北京市环境保护监测中心,北京100048

出　　处：《环境工程》2016年第4期105-109,共5页Environmental Engineering

基　　金：北京市科技计划课题(Z131100005613046);环保公益性行业科研专项(201409005);国家科技支撑计划课题(2014BAC23B03);北京市优秀人才培养资助

摘　　要：利用在线高分辨率仪器对2013年和2014年北京市SO2-4、NO-3和NH+4(SNA)浓度进行连续观测。结果表明:NO-3浓度在夜间较高,下午较低;SO2-4浓度在后半夜至早晨较低,从上午至前半夜整体呈上升趋势;NH+4浓度日变化曲线相对平缓,在整个白天时段较低,夜间时段较高。硫氧化率(SOR)夏季最高,冬季最低;氮氧化率(NOR)季节变化相对较小。2014年整体ρ(NO-3)/ρ(SO2-4)比值明显高于2013年,表明北京市的排放源中以机动车为代表的移动源的贡献明显增大。An online high time-resolution observation instrument was applied to monitor the concentrations of SO4^2-,NO3^-and NH4^＋（ SNA） in Beijing in 2013 and 2014. The results showed that concentrations of NO3^-were higher in the night and lower in the afternoon. Concentrations of SO4^2-were lower during the latter half of the night and the morning,and increased during forenoon and the first half of the night. Concentrations of NH4^＋were lower in the daytime and higher in the nighttime. The diurnal variation of NH4^＋was relatively stable. SOR was highest in summer and lowest in winter,whereas,the seasonal variation of NOR was relatively small. The overall level of the ratio of ρ（ NO3^-） /ρ（ SO4^2-） in 2014 was significantly higher than that in 2013,which indicated that the contribution of mobile source represented by vehicle increased significantly.

关 键 词：北京 PM2.5 高分辨率观测 二次水溶性无机离子 OX SOR NOR 

分 类 号：X513[环境科学与工程—环境工程]