Metallic Cobalt Particles (with or without Tungsten Carbide)
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Notes on the toxicology of cobalt metal.
This investigation originated in a report by Dr. Joan Cotterill, one of H.M. medical inspectors of factories, that workers in a Midlands factory making hard cutting tools complained of shortness of breath and that in radiographs of their lungs, some of them showed abnormal shadows. Many of the processes in the factory are trade secrets, but it is known that powdered cobalt metal is used as a bo...
متن کاملSolubilization of cobalt from tungsten carbide–cobalt powder
Several reviews of the toxicology of cobalt, including toxicokinetic aspects, are available (IARC, 1991; Midtgård & Binderup, 1994; Lauwerys & Lison, 1994; Lison, 1996; Barceloux, 1999). This section will focus on the toxicokinetic data published since the previous IARC evaluation (1991) and potentially relevant for cancer. Particular emphasis will be put on studies that examined the fate of in...
متن کاملMorphological and chemical characteristics of airborne tungsten particles of Fallon, Nevada.
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-disper...
متن کاملCharacteristics of dusts encountered during the production of cemented tungsten carbides.
Inhalation of cobalt (Co) and tungsten carbide (WC) particles, but not Co or WC alone, may cause hard metal disease, risk of which does not appear to be uniform across cemented tungsten carbide (CTC) production processes. Inhalation of Co alone or in the presence of WC may cause asthma. Hypothesizing that aerosol size, chemical content, heterogeneity, and constituent compaction may be important...
متن کاملHard metal particles and lung disease: coincidence or causality?
Accessible online at: www.karger.com/journals/res Hard metal is essentially produced by heating tungsten carbide together with cobalt powder at about 1,500°C. The resultant product consists of about 80% tungsten carbide, 10–20% cobalt, and may also contain minor amounts of other metals, frequently titanium. The combination of tungsten carbide with cobalt may – obviously in a synergistic way [1]...
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تاریخ انتشار 2008