Indirect Determination Of Sulphide Sulphur In Glass By Flame Atomic Absorption Spectrometry

TC 2 of the International Commission on Glass was asked to develop an analytical method to be used as a standardised procedure in the analysis of sulphide sulphur in glass without altering its original redox equilibria. In this procedure, sulphide sulphur is liberated from the glass with a mixture of hydrofluoric and sulphuric acid and carried by a stream of nitrogen into a silver nitrate absorption solution. After filtration, sulphide sulphur is determined by measuring the excess of silver by flame atomic absorption spectrometry. 11 laboratories took part in the collaborative investigation carried out on an amber soda lime glass. A mean value of 60.6ug S2-1kg was obtained, the corresponding coefficient of variance was 8.7%.