Characterization of magnetic particulates in urban and industrial dusts

Abstract

Morphology and mineralogy and magnetic parameters were analysed in atmospheric dust samples collected in 7 cities of Upper Silesia region (South Poland). The study was carried on by means of EDS spectroscopy, SEM technique, X-ray diffraction and Mössbauer spectroscopy. Special attention was paid to the magnetic fraction of studied dusts that is a potential carrier trace elements emitted to the environment. To assess the total content of magnetic fraction in bulk dust samples, mass specific magnetic susceptibility (χ) was measured using a MS2B "Bartington" sensor, then a physical separation of magnetic particles (mostly of technogenic origin) was conducted. The dusts revealed high diversity of χ value, which depended both on the sampling site and the prevailing direction of winds during the period of dust deposition on filters. In the case of atmospheric dusts, the χ value ranged from 10 × 10 -8 m 3 kg -1 to 1577 × 10 -8 m 3 kg -1 . The highest values were detected in samples collected within the range of metallurgical dust emission. The morphological and mineralogical analyses showed that among the technogenic magnetic fraction ferrimagnetic spherules built of iron oxides from magnetite-maghemite series with admixtures of wustite, hematite, goethite and non-stoichiometric Fe-Zn oxides were the predominant structures. Significant differences in magnetic mineralogy of dusts coming from different branches of industry were observed. Magnetic fraction produced by the metallurgy and coke industry were mostly in forms of tightly compacted aggregates with well-formed crystal structure whereas in fly ashes from coal combustion spherical forms (typical ferromagnetic spherules) were mostly observed. Here the predominant magnetic minerals are: magnetite,

Novel Technology for the Removal of Brilliant Green from Water: Influence of Post-Oxidation, Environmental Conditions, and Capping

“…Iron (Fe 0 ) and maghemite, the main constituents of the adsorbent Fe–MM, are widely available in the earth’s atmosphere. 38,39 They have been classified as sustainable materials by different groups. 40,41 Dust particles are very often formed via the aggregation of such iron particles with clay materials.…”

“…Iron (Fe 0 ) and maghemite, the main constituents of the adsorbent Fe–MM, are widely available in the earth’s atmosphere. , They have been classified as sustainable materials by different groups. , Dust particles are very often formed via the aggregation of such iron particles with clay materials . In this context, we investigated the effect of several environmentally available physicochemical conditions on the adsorption of BG on Fe–MM [Figure a].…”

Coal Fly Ash Aerosol: Risk Factor for Lung Cancer

“…Lung epithelial cells, treated with various concentrations of magnetic nanoparticles, showed that magnetite-treated cells induce oxidative stress, deplete antioxidant levels, and affect the apoptotic pathway [62]. Note the commonality: Iron oxide is a component of air pollution, CFA, and asbestos [56,63,64]; magnetite (Fe 3 O 4 ) is even found in cigarette smoke and ash [65].…”

Magnetic fraction of the atmospheric dust in Kraków – physicochemical characteristics and possible environmental impact

“…The magnetic characteristics of the atmospheric particulate matter is sometimes studied using dust fall samples (e.g. Liu et al, 2019;Magiera et al, 2010). The magnetic properties of particles deposited on biological surfaces can be useful in terms of the biomagnetic monitoring of atmospheric pollution (Hofman et al, 2017;Maher, 2009;Mejía-Echeverry et al, 2018).…”