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The development of a direct-reading spectrometric method for the determination of Al 2 O 3 , CaO, Fe 2 O 3 , T 1 O 2 , MgO and Mn 2 O 3 in high silica (> 92 per cent S 1 O 2 ) 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 2 O 3 , T 1 O 2 , MgO and Mn 2 O 3 are at least as accurate as existing chemical procedures; the results for CaO and Fe 2 O 3 are of routine control level
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Eardley et al. (1965) studied this question.
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