Morphological and chemical characteristics of airborne tungsten particles of Fallon, Nevada

Paul Sheppard, Paul Toepfer, Elaine Schumacher, Kent Rhodes, Gary Ridenour, Mark L. Witten

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Morphological and chemical characteristics were determined for airborne tungsten particles in Fallon, Nevada, a town that is distinguishable environmentally by elevated airborne tungsten and cobalt. From samples of airborne dust collected previously at six different places in Fallon, tungsten-rich dust particles were isolated and analyzed with automated electron microprobe and wavelength-dispersive spectrometry. Representative W particles were further analyzed using transmission electron microscopy. Morphologically, Fallon W particles are angular and small, with minimum and maximum sizes of ≤1 μm and 5.9 μm in diameter, respectively. The number and size of tungsten-rich particles decrease in Fallon with distance from a hard-metal facility located near the center of town. Chemically, Fallon airborne W particles include mixtures of tungsten with cobalt plus other metals such as chromium, iron, and copper. No W-rich particles were identifiable as CaWO 4 (scheelite) or MnWO4 (huebnerite). From d-spacings, Fallon particles are most consistent with identification as tungsten carbide. Based on these multiple lines of evidence, airborne W particles in Fallon are anthropogenic in origin, not natural. The hard-metal facility in Fallon processes finely powdered W and W-Co, and further investigation using tracer particles is recommended to definitively identify the source of Fallon's airborne tungsten.

Original languageEnglish (US)
Pages (from-to)296-303
Number of pages8
JournalMicroscopy and Microanalysis
Volume13
Issue number4
DOIs
StatePublished - Aug 2007

Fingerprint

Tungsten
tungsten
Dust
Cobalt
Metals
Tungsten carbide
cobalt
Spectrometry
Particles (particulate matter)
dust
metals
Chromium
scheelite
tungsten carbides
Iron
Transmission electron microscopy
Copper
Wavelength
Electrons
tracers

Keywords

  • Airborne particles
  • Automated electron microprobe analysis
  • Cobalt
  • Fallon
  • Nevada
  • Transmission electron microscopy
  • Tungsten

ASJC Scopus subject areas

  • Instrumentation

Cite this

Morphological and chemical characteristics of airborne tungsten particles of Fallon, Nevada. / Sheppard, Paul; Toepfer, Paul; Schumacher, Elaine; Rhodes, Kent; Ridenour, Gary; Witten, Mark L.

In: Microscopy and Microanalysis, Vol. 13, No. 4, 08.2007, p. 296-303.

Research output: Contribution to journalArticle

Sheppard, Paul ; Toepfer, Paul ; Schumacher, Elaine ; Rhodes, Kent ; Ridenour, Gary ; Witten, Mark L. / Morphological and chemical characteristics of airborne tungsten particles of Fallon, Nevada. In: Microscopy and Microanalysis. 2007 ; Vol. 13, No. 4. pp. 296-303.
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