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Magnetic Particles in Rainfalls: An Environmental Magnetic Evaluation  

Baatar, Amarjargal (Department of Geology and Earth Environmental Sciences, Chungnam National University)
Yu, Yong-Jae (Department of Geology and Earth Environmental Sciences, Chungnam National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.23, no.2, 2010 , pp. 99-106 More about this Journal
Abstract
To evaluate a potential wash-out effect of rainfalls, a preliminary environmental magnetic test was attempted. Measurement of isothermal remanent magnetization (IRM) and intensive microscopic observations were carried out on the solid particles extracted from the rainfalls collected for the past year (2009) in Daejeon, Korea. Dust particles collected from the rain-free (daily dust) or dustheavy days (during the Asian dust storm event) were also used as a comparison. IRMs were unanimously low for the solid particles extracted from the rainfalls, indicating an efficient wash-out effect of rainfalls as long as the magnetic concentration is concerned. Electron microscopy identified carbonbearing material, (carbon-coated) magnetite, and quartz. It is highly likely that the carbon-containing particles were produced by anthropogenic fossil fuel combustion.
Keywords
Magnetic material; magnetite; environmental magnetism; rain; dust;
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