Emission Spectrographic Analysis of Fused Aluminum Oxide and Fused Tin Oxide Crystals

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Abstract
A method is described for the analysis of fused aluminum oxide and fused tin oxide crystals in which the treatment of the samples and standards removes the effects which sample form might have on spectral excitation. The crystal sample is ground and then dissolved in a molten sodium carbonate-tetraborate flux. The cooled cake is dissolved in dilute hydrochloric acid, and an internal standard is added. A drop of the solution is dried on the flat end of a graphite electrode, and the spectra are excited with an ac arc. The elements Cr, Co, Cu, Fe, Mn, Ni. and V have been determined with the lower limits ranging from 0.001 to 0.05%. The method is applicable to many other elements over wide concentration ranges because of the convenient method of standardization.