TROPICAL GEOGRAPHY ›› 2013, Vol. 33 ›› Issue (2): 219-223.

• Original Paper • Previous Articles     Next Articles

Spatial Distribution of Road Dust Magnetic Susceptibility of Xuchang and Its Pollutional Implications

YAN Hui,WU Guoxi,LI Jingzhong,LI Dong   

  • Online:2013-03-30 Published:2013-03-30

Abstract: The use of magnetic susceptibility characteristics of the urban road dust to reflect the city's pollution is an important part of the environmental magnetic studies. The results of road dust magnetic susceptibility of Xuchang city show that: Road dust magnetic susceptibility ranges from 98.33~600.92×10-8 m3·kg-1, and the average value is 319.72× 10-8 m3·kg-1, frequency magnetic susceptibility ranges from 0.20~5.94%, with an average of 1.92%. The high magnetic susceptibility values and the low frequency magnetic susceptibility suggest that road dust has less super paramagnetic particles content, and the high magnetic susceptibility is mainly caused by the magnetic particle deposition due to human activities. Spatial characters of road dust magnetic susceptibility display a decreasing trend from northwest to southeast, which mainly caused by the city's function zoning, population density, traffic flux and environmental quality. The road dust samples of Tiexi District and the Old District have the highest magnetic susceptibility values, reflecting the serious environmental pollution that caused by high population density, heavy traffic flux and industrial activities. In East District, High-tech Development District and Southeast District the road dust magnetic susceptibility values are lower, indicating the better environmental condition. Moreover, due to the heavy traffic in the commercial centers and the freeway entrances, road dust magnetic susceptibility values are higher than those in surrounding areas. The magnetic susceptibility characteristics of road dust can intuitively reflect the pollution of the city.

Key words: magnetic susceptibility, road dust, pollution, Xuchang City