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| Comparative of magnetism parameters and heavy metals content of street dust pollution-in Wuhan |
| GUO Gao-shan1,2, LI Yong-tao3 |
1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
2. University of the Chinese Academy of Sciences, Beijing 100049, China;
3. Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China |
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Abstract A systematic study of street dust in Wuhan city, china, was carried out using combined environmental magnetism and geochemistry techniques. Magnetic measurement showed that magnetic minerals of street dust have distinct differences in spatial distribution pattern and overall values of magnetic susceptibility in the following sequence: industrial area (χ=7.36×10-6m3/kg)> traffic route(χ=5.38×10-6m3/kg)> business district(χ=3.76×10-6m3/kg)> development(χ=2.26×10-6m3/kg) and scenic areas(χ=2.48×10-6m3/kg). The results indicated that the content of magnetic minerals in the street dust mainly attributed to the industrial production and transportation factors, while the distribution of population density also had definite influence on the content of magnetic minerals. Rock magnetic measurements demonstrated that dominant magnetic components were ferrimagnetic minerals, as well as antiferromagnetic minerals. SEM/EDX analysis revealed that there were some spherical Fe-containing particles from anthropogenic activity, which was different from pedogenic ferromagnetic minerals in nature soil. The PLI showed significant correlation with the mean value of χ (R2=0.870) and SIRM (R2=0.665), which meant magnetism parameters of street dust could be seen as an indicator of heavy metals pollution.
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Received: 03 August 2016
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