【作者】 张兴赢； 庄国顺； 陈建民； 薛华欣；

【Author】 Xingying Zhang Guoshun Zhuang Jianmin Chen Huaxin XueCenter for Atmospheric Environment Study, Beijing Normal University, Beijing 100875, China;Center for Atmospheric Chemistry Study, Department of Environmental Science & Engineering,Fudan University, Shanghai 200433, China

【机构】 北京师范大学大气环境研究中心；

【摘要】 对北京沙尘暴期间和北京及沙尘暴源区内蒙多伦地区常日气溶胶颗粒物进行了XPS表面元素化学形态表征。颗粒物表面铁主要以氧化物、硫酸盐、硅酸盐、FeOOH的形式存在,还有部分附着、粘附在SiO2、Al2O3颗粒上。颗粒物表面的硫主要以硫酸盐存在。Al、Si主要以Al2O3、SiO2的形态存在。最重要的发现是在沙尘暴高峰过后的当天夜里和第二天,颗粒物表面以二价铁形式存在的FeS/FesO4高达44.3%和45.6%,而以三价铁形式存在的Fe2(SO4)3由沙尘暴高峰期间的67.1%降为49.5%和48.0%。S和Fe在颗粒物表面都相对富集。这些数据提供了气溶胶长距离传榆中铁-硫耦合机制的重要证据,进一步证实了沙尘暴对全球环境变化可能的重要影响。更多还原

【Abstract】 The speciation of the elements on the surface of the particles collected during dust storm and non-dust storm at Beijing and Inner Mongolia were studied by XPS. The major species of iron on the surface were oxides, sulfate, silicate, FeOOH and minor part sorbed on SiO2/Al2O3. Sulfate is the dominant species of sulfur on the surface. SiO2 and Al2O3 are the main components of Si and Al on the surface respectively. The one of the most important findings was that the Fe(Ⅱ) produced could account for up to 44.3% and 45.6% of the total Fe on the surface in the aerosol sample collected at that night and next day of the "peak" time of the dust storm occurred on March 20, 2002, while Fe2(SO4)3, one of the Fe (Ⅲ) species on the surface decreased from 67.1% to 49.5% and 48.0% respectively. Both S and Fe enriched on the surface of aerosol particles. These results provided strong evidences to support the hypothesis of the coupling between iron and sulfur in aerosols during the long-distance transport, which would have important impact on the global biogeochemical cycle.更多还原