Speaker
Description
The aim of the study was to characterize, using Mössbauer spectrometry and magnetic analysis, the technogenic magnetic particles (TMPs) from non-ferrous metallurgy, cement, coke, glass production as well as long-range transport (LRT) [1] and compare the obtained data with previous results focused on iron mining and metallurgy [2]. The basic magnetic parameters used for TMPs characterization are magnetic susceptibility, saturation magnetization, remnant magnetization after saturation, standard coercivity, and coercivity of remanence. The Mössbauer spectrometry provides additional characteristics like hyperfine magnetic fields, quadrupole splitting, isomer shift, percentage of iron-bearing phases and stoichiometry parameter of magnetite.
The main characteristics of TMPs produced by Fe mining are: high values of concentration-dependent magnetic parameters, low values of coercivity, a significant contribution from coarse grains and a relatively high stoichiometry of magnetite. The most discriminative feature for TMPs generated by the glass industry is the abundance of goethite in the topsoil samples. The TMPs released by the Ni-Cu smelter and the Pb-Zn waste exhibit significant differences in the Mössbauer parameters, indicating different stoichiometry of magnetite for each group. Such variations are due to the replacement of Fe by other elements at tetrahedral sites in the case of TMPs released from the Ni-Cu smelter. The magnetic features of TMPs from cement production depend on the applied technology. TMPs characteristic for the LRT emissions contain a higher amount of finer fraction of low stoichiometry magnetite strong influence of the local pollution.
Acknowledgements
The study was partially funded by the National Science Center of Poland (project n° 2016/23/B/ST10/02814). Special thanks to Prof. Tadeusz Magiera, Prof. Beata Górka-Kostrubiec and Dr Michał S. Bućko for very fruitful work on the project.
References
[1] T. Magiera et al., “Technogenic magnetic particles in topsoil: Characteristic features for different emission sources,” Science of The Total Environment, vol. 865. Elsevier BV, p. 161186, Mar. 2023. https://doi.org/10.1016/j.scitotenv.2022.161186
[2] T. Magiera et al., “Technogenic magnetic particles from steel metallurgy and iron mining in topsoil: Indicative characteristic by magnetic parameters and Mössbauer spectra,” Science of The Total Environment, vol. 775. Elsevier BV, p. 145605, Jun. 2021. https://doi.org/10.1016/j.scitotenv.2021.145605
