摘要
利用单颗粒气溶胶质谱仪对张家口市2015年春季的一次典型沙尘过程进行了监测,分析了沙尘过程对当地大气颗粒物成分的影响。结果表明,监测期间的颗粒物类型主要分为8种:矿物质(MD)、左旋葡聚糖(LEV)、元素碳(EC)、有机碳(OC)、混合碳(ECOC)、重金属(HM)、富钾(K)、其他(Other)。对比沙尘天气来临前、中、后3个时段,随着沙尘天气的来临,本地大气颗粒物成分发生较大变化,矿物质、左旋葡聚糖等成分含量升高,而有机碳、重金属等成分含量下降,其中矿物质在PM10峰值时段小时比例高达27.8%;沙尘天气期间,由于矿物质颗粒占比增加,使得总颗粒物的粒径分布向0.9μm以上的粗粒径段偏移;此外,沙尘天气期间的颗粒物各成分与二次组分的混合程度相较非沙尘天气时段的低,说明其老化程度相对较低。
A single particle aerosol mass spectrometer % SPAMS） was deployed in Zhangjiakou during a sandstorm period to evaluate the impact of sandstorm to ambient aerosols. According to the monitoring result, particles during the monitoring period can be divid-ed into eight types ： mineral dust% MD ）,levvgluccsan % LEV）,elemental carbon% EC）, organic carbon% OC）,ganic and elemental carbon% ECOC）, heavy metal% HM） ’ K-rich % K ） ,others % Other） . Profound changes of were discovered through comparative analysis of particles during diferent stages of the sandstorm. As the sandstorm begins ’ the pro-portion of MD and LEV increased,while those of OC and HM decreased at the same time. In partpeak hours of p% PMw ） was up to 27. 8% . The size distribution of total particles increased to 0. 9 !m above during the sandstorm due to the dramatically increasing of MD proportion. In addition ’ the extent of mixing of particles witli secondary components during the dust weather was relatively low,indicating that particles during sandstorm were less aged.
出处
《环境监控与预警》
2018年第1期46-50,共5页
Environmental Monitoring and Forewarning
关键词
张家口市
沙尘天气
成分
颗粒物
粒径
混合程度
单颗粒气溶胶质谱仪
Zhangjiakou city
Sandstorm
Chemical composition
Particles $ Size distribution $ Mixing
Single particle aerosol massspectrometer
