Abstract
IT is well known that iron, present in glasses as an impurity, has a most important effect in reducing their transmission of ultra-violet radiation. Of both theoretical and practical importance is the exact quantitative effect, at various wave-lengths, of iron in both the ferrous and ferric condition and in glasses of various compositions. On this question the most authoritative work known to me is that of D. Starkie and W. E. S. Turner1 who, unlike other authors, quoted precise chemical compositions, including ferrous and ferric iron contents, together with complete transmission data. Curve P. 131 in the graph is taken from their work and shows that a soft soda glass containing 0·01 per cent of iron oxide cut off completely at ˜ 2650 A., the iron in the glass being practically all in the ferrous condition. With the same percentage iron content, but practically all in the ferric condition, the same glass cut off at even longer wave-lengths (˜ 2675 A.). Starkie and Turner studied a glass containing so little as 0·005 per cent iron oxide, and concluded by extrapolation that a glass completely without iron would cut off at ˜ 2230 A.
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05 June 1948
An Erratum to this paper has been published: https://doi.org/10.1038/161882f0
References
Starkie, D., and Turner, W. E. S., J. Soc. Glass Tech., 15, 365 (1931).
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STANWORTH, J. Transmission of Bactericidal Radiation through Glass. Nature 161, 856 (1948). https://doi.org/10.1038/161856a0
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DOI: https://doi.org/10.1038/161856a0
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