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"

The paper illustrates a procedure recommended by Technical Committee 14 (TC 14 "Gases in Glass") of the International Commission on Glass (ICC) for the determination of the water content of soda-lime-silica glass by infrared t ransmittance spectroscopy, based on the two bands at 2.8 and 3.6 mu m using as extinction coefficients 70 and 150 l/(mol . cm), respectively. As shown by the result of two intercomparisons, the agreement on the determined wat er concentration values can be quite satisfactory, within +/-20 ppm, provid ed the procedure to evaluate the spectral curves is closely specified. The selected extinction coefficients are in reasonable agreement with recent ev idence obtained using Nuclear Reaction Analysis.