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Isolation of technogenic magnetic particles.

Mickaël Catinon1, Sophie Ayrault2, Omar Boudouma3

  • 1Laboratoire LECA, UMR 5553, Equipe Pollution, Environnement, Ecotoxicologie et Ecoremédiation, Univ. J. Fourier, 38041 Grenoble, France.

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Summary

Technogenic magnetic particles (TMPs) from iron smelting plants were analyzed on tombstones. An efficient protocol isolated TMPs, revealing diverse compositions and enabling source identification.

Keywords:
Air pollutionICP-MSMagnetic particlesSEM–EDXTechnogenic particles

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Materials Science

Background:

  • Industrial activities, like smelting, release technogenic magnetic particles (TMPs) into the atmosphere.
  • These TMPs are deposited on various environmental surfaces, including soil and man-made structures.
  • Tombstones offer a unique substrate for studying TMPs due to their stability and distinct depositional environment compared to natural surfaces.

Purpose of the Study:

  • To characterize the origin and composition of TMPs emitted from an iron smelting plant.
  • To evaluate tombstones as a suitable substrate for TMP analysis.
  • To develop and validate an efficient protocol for TMP isolation and characterization.

Main Methods:

  • Sample collection from tombstones near an iron smelting plant.
  • Development of a multi-step isolation protocol involving water suspension, sonication, magnetic extraction, sedimentation, and sieving.
  • Thermal treatment (550 °C) for organic matter destruction.
  • Characterization using Scanning Electron Microscope Energy Dispersive X-ray (SEM-EDX).

Main Results:

  • An effective protocol was established for separating TMPs from tombstone samples.
  • Isolated TMPs exhibited crystalline structures with variable compositions, including pure iron oxides, iron with Cr, Ni, or Zn, and complex mixtures with Ca, Si, Mg, and Mn.
  • SEM-EDX analysis provided detailed compositional profiles, facilitating the identification of TMP sources.

Conclusions:

  • Tombstones serve as an effective matrix for the study of atmospheric TMPs.
  • The developed isolation protocol is efficient for characterizing TMPs.
  • TMPs from the iron smelting plant have diverse compositions, allowing for source attribution through detailed analysis.