Magnetic properties and heavy metal contents of automobile emission particulates

Abstract： Measurements of the magnetic properties and total contents of Cu, Cd, Pb and Fe in 30 automobile emission particulate samples indicated the presence of magnetic particles in them. The values of frequency dependent susceptibility (χfd)showed the absence of superparamagnetic (SP) grains in the samples. The IRM20 mT (isothermal remanent magnetization at 20 mT)being linearly proportional to SIRM (saturation isothermal remanent magnetization) (R2=0.901), suggested that ferrimagnetic minerals were responsible for the magnetic properties of automobile emission particulates. The average contents of Cu, Cd, Pb and Fe in automobile emission particulates were 95.83, 22.14, 30.58 and 34727.31 mg/kg, respectively. Significant positive correlations exist between the magnetic parameters and the contents of Pb, Cu and Fe. The magnetic parameters of automobile emission particulates reflecting concentration of magnetic particles increased linearly with increase of Pb and Cu content, showed that the magnetic measurement could be used as a preliminary index for detection of Pb and Cu pollution. 作 者： LU Sheng-gao    BAI Shi-qiang    CAI Jing-bo    XU Chuang   作者單位： School of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310029, China  期 刊： 浙江大學(xué)學(xué)報B（英文版）  SCI   Journal： JOURNAL OF ZHEJIANG UNIVERSITY SCIENCE B  年，卷(期)： 2005, 6(8)  分類號： X5  Keywords： Automobile emission particulates    Magnetic properties    Heavy metal    Environmental magnetism   

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