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Please use this identifier to cite or link to this item: http://dspace.lib.cranfield.ac.uk/handle/1826/3348

Document Type: Postprint
Title: Assessment of the environmental toxicity and carcinogenicity of tungsten-based shot.
Authors: Thomas, Vernon G.
Roberts, Michael J.
Harrison, Paul T. C.
Issue Date: May-2009
Citation: Vernon G. Thomas, Michael J. Roberts, Paul T.C. Harrison, Assessment of the environmental toxicity and carcinogenicity of tungsten-based shot, Ecotoxicology and Environmental Safety, Volume 72, Issue 4, May 2009, Pages 1031-1037
Abstract: The toxicity of elemental tungsten released from discharged shot was assessed against previous studies that established a 1% toxic threshold for soil organisms. Extremely heavy theoretical shot loadings of 69,000 shot/ha were used to generate estimated environmental concentrations (EEC) for two brands of tungsten-based shot containing 51% and 95% tungsten. The corresponding tungsten EEC values were 6.5–13.5 mg W/kg soil, far below the 1% toxic threshold. The same shot loading in water produced tungsten EEC values of 2.1–4.4 mg W/L, levels that are not toxic under experimental conditions. Pure tungsten has not been shown to exhibit carcinogenic properties when ingested or embedded in animal tissues, but nickel, with which it is often alloyed, has known carcinogenicity. Given the large number of waterfowl that carry shot embedded in their body, it is advisable to screen lead shot substitutes for their carcinogenic potential through intra-muscular implantation.
URI: http://dx.doi.org/10.1016/j.ecoenv.2009.01.001
http://hdl.handle.net/1826/3348
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