青岛采暖期不同天气状况下大气颗粒态无机氮分布研究  

Distribution of Atmospheric Particulate Inorganic Nitrogen in Different Weather Conditions in the Heating Period in Qingdao

作　　者：乔佳佳[1,2] 祁建华[1,2] 刘苗苗[1] 范得国[1,2] 石金辉[1,2] 高会旺[1,2] 

机构地区：[1]中国海洋大学环境科学与工程学院,青岛266100 [2]中国海洋大学海洋环境与生态教育部重点实验室,青岛266100

出　　处：《环境科学》2010年第1期29-35,共7页Environmental Science

基　　金：国家自然科学基金重大项目(40490262);国家重点基础研究发展规划(973)项目(2006CB403703)

摘　　要：于2007-10～2008-04采集了青岛近海采暖前及采暖期内大气气溶胶样品,并运用离子色谱法(IC)分析了颗粒物中的无机氮组分.结果表明,采暖期内青岛颗粒物和无机氮的浓度都有明显增加,采暖期颗粒物质量浓度为137.41μg/m3,比采暖前增加了82.2%;NO3--N和NH4+-N浓度分别由采暖前的2.48μg/m3和6.95μg/m3增加到采暖期的4.43μg/m3和10.28μg/m3.天气过程对于青岛颗粒物浓度和无机氮离子浓度均有较大影响.采暖期晴天颗粒物浓度均值为181.34μg/m3,较采暖前增加32.0%,主要源于二次气溶胶的NH4+-N和NO3--N浓度分别为5.56μg/m3和1.86μg/m3,低于采暖前.雾天因为低温高湿和污染物的循环积累,样品中颗粒物、NH4+-N和NO3--N平均浓度比采暖前浓度增加了1～2倍.大风降温天气下颗粒物浓度及无机氮组分浓度均有所降低.采暖期烟尘和飞灰的排放明显影响青岛大气颗粒物和无机氮的粒径分布,特别是细粒子部分.青岛近海颗粒物及NO3--N质量浓度呈现双峰分布,采暖前峰值出现在0.43～0.65μm与3.3～4.7μm的范围内,采暖期积聚模态峰值移至0.65～1.1μm范围内.NH4+-N粒径分布均呈现明显的单峰分布,峰值出现在积聚模态.The atmospheric aerosol samples were collected before and in the heating period during October 2007-April 2008 in Qingdao coastal region,and inorganic nitrogen components were analyzed using IC（Ion Chromatography）.The results showed that the concentration of aerosol particles and particulate inorganic nitrogen components（NH4^＋,NO3^-） were increased from 137.41 μg/m^3,2.48 μg/m^3,6.95 μg/m^3 before to 250.34 μg/m^3,4.43 μg/m^3,10.28 μg/m^3 in the heating period respectively.The concentrations of TSP（total suspended particles） and inorganic nitrogen in Qingdao were influenced by different weather conditions.The average concentration of TSP was 181.34 μg/m^3 in sunny days during heating period,increased by 32.0% than before.But the nitrate and ammonium showed a value of 5.56 and 1.86 μg/m^3 in sunny days,lower than that before heating,which mainly came from secondary aerosols.The average concentrations of TSP,nitrate and ammonium increased were 1-2 times higher in foggy days in heating period due. to lower temperature,high humidity and accumulation of pollutants.The concentrations of TSP,nitrate and ammonium decreased in strong winds and temperature drop weather.The size distribution of aerosol particles and inorganic nitrogen,were influenced clearly by heating soot and ash.The size distribution of nitrate showed double peaks with a higher peak in accumulation mode（0.43-0.65 μm） and a lower one in coarse mode（3.3-4.7 μm） before heating,and the peak in the ＇accumulation mode＇ shifted to 0.65-1.1 μm during heating period.NH4^＋-N,a major inorganic nitrogen component in the particulate matter,showed single peak in the ＂accumulation mode＂.

关 键 词：气溶胶 无机氮 采暖期 青岛 

分 类 号：X513[环境科学与工程—环境工程]