A Comparison between the Standard Method and certain more Rapid Methods for the Analysis of Simple Glasses
JSGT 1936 V20 T338-344
A number of commercial soda–lime–silica glasses were analysed in two laboratories by two methods: (1) the standard procedure involving decomposition of 1 g by Na2CO3, two evaporations with HCl to remove SiO2, removal of As by H2S, precipitation of Al+Fe by NH4OH, and of Ca as oxalate, and ignition to oxide; (2) decomposition of 1 g by HF and H2SO4, followed by analysis of the HCI solution of the residue, as in (1). Provided the HF decomposition was conducted with care, there was no appreciable difference in the results for Al2O3 and CaO by the two methods. The comparison was extended to glasses containing both CaO and MgO.
J. D. Cauwood & Violet Dimbleby
