| 天气与气候 |
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| Magnetic Property of Lanzhou Dustfall and Its Implication in Urban Pollution |
XIA Dun-sheng1, WANG Guan 2, MA Jian-ying1, YANG Li-ping2, LIU Yu-zhang2, CHEN Fa-hu2 |
| 1.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences; Key Laboratory of Desert and Desertification, Chinese Academy of Sciences, Lanzhou 730000, China; 2.Key Laboratory for Western China's Environmental System of Ministry of Education, Lanzhou University, Lanzhou 730000, China |
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Abstract In this study a set of environmental magnetic parameters (χlf, χfd%,χarm, SIRM, HIRM, SOFT and back field IRM) were measured on the monthly\|collected dustfall samples(KLD), which were collected during April 1997 to May 2000 and November 2004 to October 2005 at Lanzhou University campus. The results demonstrate that the main magnetic minerals in the dustfall are magnetite and/or maghaemite. Cross plots of Mrs/Ms vs. Bcr/Bc and χfd % vs. χarm/SIRM indicate that the main magnetic grain sizes in street dust are pseudo single domain (PSD). With the great efforts of the government and local authority to control the urban environment during the past decades, the air quality in Lanzhou has been improved greatly in winter, but it is not so obvious in summer. This research also reveals that as a simple, rapid and no\|distrusting technology, environmental magnetism could be a valuable tool in pollution study.
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Received: 15 September 2006
Published: 20 September 2007
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2007, Vol. 27 
