Anthropogenic contribution of magnetic particulates in urban roadside dust

Wonnyon Kim, Seong-Jae Doh, Yongjae Yu

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Abstract

Environmental magnetism parameters have been optimized as qualitative proxy indicators of the distribution of anthropogenic particulates, heavy metals and/or organic materials. In the present study, we propose a quantitative magnetic proxy which is suitable for the monitoring of spatial and temporal pollution patterns in urban areas. A total of 1353 roadside dust samples were collected from Seoul, Korea for 13 months. Thermomagnetic data and intensive electron microscopy identified a predominance of carbon-bearing iron-oxides, indicating that anthropogenic particulates mostly originated from fossil fuel combustions. To quantify anthropogenic particulates, an apparent magnetic concentration [AMC Fe3 O4 = observed saturation magnetization (M s) / M s of Fe 3 O 4 (= 92.36 Am 2 kg - 1)] was calculated. AMC Fe3 O4 showed distinctive spatial and seasonal dependences: highest in industrial areas and lowest in park areas; and maximum in winter and minimum in summer. Seasonal mapping using AMC Fe3 O4 illustrated that industries in southwestern Seoul were the major pollution source. In addition, dominant westerly winds possibly transported pollutants along topographically lower areas in Seoul.

Original languageEnglish
Pages (from-to)3137-3144
Number of pages8
JournalAtmospheric Environment
Volume43
Issue number19
DOIs
Publication statusPublished - 2009 Jun 1

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Keywords

  • Apparent magnetic concentration
  • Carbon-bearing iron-oxide
  • Environmental pollution
  • Magnetic pollution map

ASJC Scopus subject areas

  • Atmospheric Science
  • Environmental Science(all)

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