| Abstrakt: |
A simple, precise and sensitive method is described for the simultaneous determination of major constituents (Al2O3and Si02) and impurities (Ca, Cr, Fe, K, Li, Mg, Mn, Na, Sr, Ti, V, Y, Zn and Zr) in high-purity mullite (3Al2O3·2SiO2). A 0.5 g amount of the powder sample was decomposed with 5 ml of H2SO4(1+2) at 230°C for 16 h in a polytetrafluoroethylene pressure vessel. The decomposed mixture was separated to a solution and a precipitate by filtration. After the solution was diluted to a constant volume with water, inductively coupled plasma atomic emission spectrometric analysis for the impurity elements and conventional volumetric analysis for Al2O3were carried out. The precipitate was ashed in a platinum crucible and gravimetric analysis for SiO2was carried out. The proposed method was successfully applied to the simultaneous determination of Al2O3, SiO2and the impurities in commercial mullite samples. The analytical results were in good agreement with those obtained by other methods. This method has advantages in simplicity, good precision and high sensitivity for the comprehensive analysis of high-purity mullite. |
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