Spectroscopic techniques for the determination of the iron redox state of glass and their direct application in the glass factory

Author： Ajò D. De Zuane F. Caramazza G. Gambaro M. Guadagnino E. Morucchio P. Polato P. Rizzo G.

Publisher： Society of Glass Technology

ISSN： 0017-1050

Source： Glass Technology - European Journal of Glass Science and Technology Part A, Vol.40, Iss.4, 1999-08, pp. : 116-120

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Abstract

Some preliminary investigations are described in this paper to check whether the daily controlling of the redox state of glass can be performed directly in the glass factory using complementary techniques such as spectrophotometry and photoluminescence spectroscopy. The advantage of spectroscopic techniques with respect to the traditional wet chemical method is speed and simplicity of the measurement procedure (no specialised operators are required) once the whole procedure has been well established. However, the chemical method remains the absolute reference one to be used in cases of difficult interpretations (sudden variation of the redox state, unpredictable presence of other chromo- phores, etc.) or when initial calibrations of the spectroscopic techniques are required. These calibrations should be performed using glasses produced by the same factory with the highest possible variations in ferrous and ferric iron concentrations.