Presence of tungsten-containing fibers in tungsten refining and manufacturing processes.

The Annals of Occupational Hygiene
John L McKernanMartin R Petersen

Abstract

In tungsten refining and manufacturing processes, a series of tungsten oxides are typically formed as intermediates in the production of tungsten powder. The present study was conducted to characterize airborne tungsten-containing fiber dimensions, elemental composition and concentrations in the US tungsten refining and manufacturing industry. During the course of normal employee work activities, seven personal breathing zone and 62 area air samples were collected and analyzed using National Institute for Occupational Safety and Health (NIOSH) fiber sampling and counting methods to determine dimensions, composition and airborne concentrations of fibers. Mixed models were used to identify relationships between potential determinants and airborne fiber concentrations. Results from transmission electron microscopy analyses indicated that airborne fibers with length >0.5 microm, diameter >0.01 microm and aspect ratios > or =3:1 were present on 35 of the 69 air samples collected. Overall, the airborne fibers detected had a geometric mean length approximately 3 microm and diameter approximately 0.3 microm. Ninety-seven percent of the airborne fibers identified were in the thoracic fraction (i.e. aerodynamic diameter < or = 10 microm)...Continue Reading

References

Jan 1, 1988·Free Radical Biology & Medicine·P A WardK J Johnson
Sep 1, 1996·American Industrial Hygiene Association Journal·P A Baron
Nov 18, 1996·The Science of the Total Environment·W SahleI Laszlo
May 3, 2001·AIHAJ : a Journal for the Science of Occupational and Environmental Health and Safety·M M Finkelstein, D K Verma
Jun 24, 2008·Journal of Occupational and Environmental Hygiene·John L McKernanJoseph E Fernback
Apr 1, 1995·Toxicology in Vitro : an International Journal Published in Association with BIBRA·P Leanderson, W Sahle

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Citations

Dec 21, 2012·Brain Injury : [BI]·Mario F MendezEliot A Licht
May 7, 2013·Annual Review of Biomedical Engineering·Kristian FranzeJochen Guck
May 7, 2014·Journal of Neuroscience Research·Eric J NeubergerVijayalakshmi Santhakumar
Sep 10, 2021·Toxicological Sciences : an Official Journal of the Society of Toxicology·Kara MillerAlicia M Bolt

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