Mineralogical characteristics of airborne particles collected in Beijing during a severe Asian dust storm period in spring 2002
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- 作者：LongYi Shao (1) (2)
WeiJun Li (1) (2)
ShuShen Yang (1) (2)
ZongBo Shi (3)
SenLin Lü (1) (2) - 关键词：Asian dust storm (ADS) ; inhalable particle (PM10) ; X ; ray diffraction (XRD) ; individual particles analysis ; Beijing
- 刊名：Science China Earth Sciences
- 出版年：2007
- 出版时间：June 2007
- 年：2007
- 卷：50
- 期：6
- 页码：953-959
- 全文大小：3857KB
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WeiJun Li (1) (2)
ShuShen Yang (1) (2)
ZongBo Shi (3)
SenLin Lü (1) (2)
1. The State Key Laboratory of Coal Resources and Safety Mining, China University of Mining and Technology, Beijing, 100083, China
2. Department of Resources and Earth Sciences, China University of Mining and Technology, Beijing, 100083, China
3. Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, Kumamoto, 862-8502, Japan - ISSN：1869-1897
文摘
Asian dust storm (ADS) samples were collected on March 20, 2002 in Beijing, China. High-resolution field emission scanning electron microscopy with energy dispersive X-ray detector (FESEM-EDX) and X-ray diffraction (XRD) were used to study the morphology, chemical compositions, number-size distributions and mineralogical compositions of ADS particles. The mineral particles were major components in the ADS samples, accounting for 94% by number. The XRD analysis indicated that the dust particles were dominated by clay (40.3%), and quartz (19.5%), followed by plagioclase (8.4%), calcite (7.5%), K-feldspar (1.5%), hematite (0.9%), pyrite (0.9%), hornblende (0.4%) and gypsum (0.3%), with a certain amount of noncrystalline materials (20.3%). Clay minerals were mainly illite/smectite mixed layers (78%), followed by illite (9%), kaolinite (6%), and chlorite (7%). In addition to these main minerals, FESEM-EDX also detected some trace minerals, such as dolomite, pyrite, thenardite, as well as heavy minerals represented by rutile, ilmenite and apatite. The mineralogical compositions of the 2002-03-20 Asian dust storm and the Saharan dust plumes were similar but the clay mineralogy showed a great distinction, with the illite/smectite mixed layers being common in the Asian dust storm but illite being common in the Saharan dust plumes.