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Author: Geißler, Heinz × Author: Geotti-Bianchini, Franco × Type: Text × Publisher: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft ×

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    Intercomparison of IR transmittance measurements on water-containing glasses : Report of the International Commissionon Glass (ICG) Technical Committee14 "Gases in Glass"
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 2000) Geotti-Bianchini, Franco; Preo, Martina; Smith, lan H.; Nijnatten, Peter van; Geißler, Heinz; Bucher, Greg
    Α previous paper illustrated a procedure recommended by Technical Committee 14 (TC 14 "Gases in Glass") of the International Commission on Glass (ICG) for the determination of the water content of soda-lime-silica glasses by infrared transmittance spec-troscopy. The present paper describes the results of an intercomparison of spectral transmittance measurements performed by TC 14 in order to check the interlaboratory reproducibility that can reasonably be expected when a range of industrial laboratories determines the water content of a given sample. Three samples were circulated within a group of 10 laboratories and for each of them17 spectral transmittance curves were reported, using various spectrophotometers. From each spectrum the corresponding water content value was calculated, using the TC 14 procedure. Α statistical elaboration of the results is presented. The spectral transmittance values were affected by a significant spread, with maximum relative deviations up to 14.4 % (maximum relative standard deviation 4.5 %).The spread affecting the corresponding calculated water contents was much smaller, with maximum relative deviations within 4.8 % (maximum relative standard deviation 1.3 %).
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    Recommended procedure for the IR spectroscopic determination of water in soda-lime-silica glass : Report of the International Commission on Glass (ICG) Technical Committee 14 "Gases in Glass"
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1999) Geotti-Bianchini, Franco; Geißler, Heinz; Krämer, Fritz; Smith, Ian H.
    The paper illustrates a procedure recommended by Technical Committee 14 (TC14 "Gases in Glass") of the International Commission on Glass (ICG) for the determination of the water content of soda-lime-silica glass by infrared transmittance spectroscopy, based on the two bands at 2.8 and 3.6 μm using as extincdon coefficients 70 and 150 l/(mol · cm), respectively As shown by the result of two intercomparisons, the agreement on the determined water concentration values can be quite satisfactory, within ±20 ppm, provided the procedure to evaluate the spectral curves is closely specified. The selected extinction coefficients are in reasonable agreement with recent evidence obtained using Nuclear Reaction Analysis.