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Magnetic properties of dust in Fuzhou parks and their environmental significance |
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Abstract To effectively monitor environmental pollution in Fuzhou city, magnetic properties of dust from different parks were detected. Results show that the mean value of χ, χfd%、SIRM、S-ratio and SIRM/χ were 269.80×10-8 m3/kg, 0.73, 6175.07×10-5(A×m2)/kg, 0.91 and 30.82A/m, respectively. The primary magnetic minerals of dust samples were identified to be ferromagnetic minerals (magnetite and maghemite), even hematite was found in some samples, in the single domain (SD) and pseudo-single domain (PSD) grain size in Day-plot. Magnetic concentration and grain sizes of dust in Fuzhou parks were controlled by anthropogenic activities, e.g. traffic and city construction, landform and typhoon, especially the area around second ring road. Results demonstrate that details measurements of magnetic properties can serve as an efficient complementary tool for monitoring environmental pollution in Fuzhou.
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Received: 04 September 2012
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