基于单颗粒气溶胶质谱技术的厦门细颗粒谱分布研究

Study of Aerosol Chemical Compositions and Size Distribution Property of Coastal Area in Xiamen

采用单颗粒气溶胶飞行时间质谱仪（SPAMS）和气溶胶粒径谱仪（AGM-1500）对厦门大气气溶胶颗粒进行了实时在线分析,获得了大气气溶胶颗粒的粒径和化学组成的谱分布。结果表明：利用WPS和SPAMS测量PSL颗粒得到的结果具有相同谱分布规律,但SPAMS检测到的颗粒数要比WPS测得的颗粒数浓度低,WPS测量得到的厦门大气气溶胶颗粒呈双模态分布,模粒径分别为0.03μm和0.6μm,利用SPAMS测量得到的厦门大气气溶胶为单峰分布,峰值粒径为0.6μm。厦门大气中含有的常见离子组分：NOx-,HSO4-,Cl-,NH4＋,Na＋,K＋,Fe2＋,Cu2＋,Al3＋,Ca2＋,Pb2＋等。NOx-,HSO4-和K＋具有很强的谱峰,表明厦门大气细颗粒中存在较为严重的二次污染及污染物的输入。Na和Cl元素也表现出较强的谱峰,说明该区域海盐粒子对大气气溶胶中具有较大的影响。

Ambient aerosol in Xiamen was measured in real-time by Single particle aerosol mass spectrometer （SPAMS） and aerosol generation and monitor（AGM-1500）.The Chemical compositions and size distributions characteristics of aerosol particles were obtained.The results showed that the number size distribution of PSL particle measured by SPAMS is the same with the measurement result by WPS, but the particle number detected by SPAMS is much lower than WPS.The aerosol particle measured by WPS in Xiamen seems a bimodal distribution with particle diameter of 0.03mm and 0.6mm. However, it is disturbed singly with a peak diameter value of 0.6mm. detected by SPAMS.The chemical compositions contained in aerosol particles are NOx-,HSO4-,Cl- ,NH4＋ ,Na＋,K＋,Fe2＋,Cu2＋,Al3＋,Ca2＋,Pb2＋ etc..There are strong spectrums of NOx-,HSO4-and K＋, which indicates that there seems serious secondary aerosol pollution in the ambient atmosphere. Strong Na and Cl element peaks also indicate a significant impact of sea salt particles on the aerosols in Xiamen ambient atmosphere.