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This method provides for the acid digestion of silicon metal in a closed vessel using pressure controlled microwave heating for the determination of metals by spectroscopic methods (Note A). The metal was approximately 93.8% SiO2, 4.8% Al2O3, 1.0% Fe2O3, 0.3% TiO2, 0.1% CaO, MgO 0.1%,and Na2O 0.1%.
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