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Size Separation of Amosite by Filtration and Shaking Methods.

Taekhee Lee1, Rachel Walker1, Jon Hummer1

  • 1Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Pittsburgh Mining Research Division, Health Hazards Prevention Branch, 626 Cochrans Mill Rd., Pittsburgh, PA 15236, USA.

Asbestos and Other Elongate Mineral Particles : New and Continuing Challenges in the 21St Century
|May 22, 2023
PubMed
Summary

This study successfully separated fibrous grunerite (amosite) into short and long fiber groups using filtration and shaking methods. The filtration yielded short amosite fibers, while the shaking method produced long amosite fibers efficiently.

Keywords:
amositeasbestoselongate mineral particleslength separation

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Area of Science:

  • Materials Science
  • Environmental Science
  • Occupational Health

Background:

  • Fibrous grunerite (amosite) poses health risks, necessitating methods for its separation and characterization.
  • Understanding amosite fiber length distribution is crucial for exposure assessment and risk management.

Purpose of the Study:

  • To develop a cost-effective method for separating amosite into distinct short and long fiber groups.
  • To optimize filtration and shaking techniques for higher output of separated amosite.

Main Methods:

  • Utilized a shaking system with an electrodynamic exciter and filtration through serial polycarbonate membrane filters (10- to 0.2-microm pore sizes).
  • Employed field emission scanning electron microscopy (FESEM) and ImageJ software for manual measurement of amosite fiber length and diameter.
  • Collected approximately 500 fibers per sample for length and width analysis.

Main Results:

  • Achieved statistically significant separation of amosite into short (<5 microm) and long (>5 microm) fiber groups (p <0.05).
  • Filtration method yielded approximately 95% short amosite fibers (n=499).
  • Shaking method yielded approximately 80% long amosite fibers (n=503).

Conclusions:

  • The developed filtration and shaking techniques effectively separate amosite into distinct length groups.
  • These methods offer a cost-effective approach for obtaining higher outputs of specific amosite fiber lengths for further research.