Abstract
The development of a direct-reading spectrometric method for the determination of Al<sub>2</sub>O<sub>3</sub>, CaO, Fe<sub>2</sub>O<sub>3</sub>, TiO<sub>2</sub>, MgO and Mn<sub>2</sub>O<sub>3</sub> in high silica (>92 per cent SiO<sub>2</sub>) is described. Once the effect of silica on the spectral intensities has been evaluated it has proved possible to 'set up' the instrument on silica-free standards without loss of accuracy. The results for Al<sub>2</sub>O<sub>3</sub>, TiO<sub>2</sub>, MgO and Mn<sub>2</sub>O<sub>1</sub> are at least as accurate as existing chemical procedures; the results for CaO and Fe<sub>2</sub>O<sub>3</sub> are of routine control level
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