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Integration of chemical fractionation, Mosbauer spectrometry, and magnetic methods for identification of Fe phases bonding heavy metals in street dust

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Journal of Environmental Sciences 2023年第2期 875-891页

作者： Beata Gorka-Kostrubiec ryszard swietlik Tadeusz Szumiata Sylwia Dytłow Marzena Trojanowska Institute of Geophysics Polish Academy of Sciencesks.Janusza 6401-452 WarsawPoland Department of Environmental Chemistry and Engineering University of Technology and Humanities in Radom27 Bolesława Chrobrego Str.26-600 RadomPoland Department of Physics Faculty of Mechanical EngineeringUniversity of Technology and Humanities in Radom54 Krasickiego Str.26-600 RadomPoland

Street dust is one of the most important carriers of heavy metals(HMs)originating from natural and anthropogenic *** main purpose of the work was to identify which of Fe-bearing phases bind HMs in street *** parameters of the Fe-bearing components,mainly magnetically strong iron oxides,are used to assess the level of HM *** sequential extraction combined with magnetic methods(magnetic susceptibility,magnetization,remanent magnetization)allowed determining the metal-bearing fractions and identifying the iron forms that aremostly associated with traffic-related *** use of Mossbauer spectrometry(MS)supplemented bymagnetic methods(thermomagnetic curves and psarameters of hysteresis loops)enabled precise identification and characterization of iron-containing *** classification of HMs into five chemical fractions differing in mobility and bioaccessibility revealed that iron is most abundant(over 95%)in the residual fraction followed by the reducible *** were present in reducible fraction in the following order:Pb>Zn>Mn>Cr>Ni>Fe>Cu,while they bound to the residual fraction in the following order:Fe>Ni>Cr>Mn>Pb>Cu>*** signature of the anthropogenic origin of street dust is the presence of strongly nonstoichiometric and defected grains of magnetite and their porous *** also occurs as an admixture with maghemite,and with a significant proportion of hematite.A distinctive feature of street dust is the presence of metallic iron and iron *** methods are efficient in the screening test to determine the level ofHMpollution,while MS helps to identify the iron-bearing minerals through the detection of iron.

关键词： Heavy metals Street dust Chemical fractionation Magnetic methods Mossbauer spectrometry

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