Determination of Minor Elements in High-purity Mullite by Acid Decomposition:Associated with a Microwave Oven/ICP-AES
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ICP-AES was applied to the determination of Ca, Mg, Fe, Ti, Zr, Hf, Ni, Cr and Y in high-purity mullite. A 0.100g sample powder with 5ml of (1+1) phosphoric acid and 1 ml of 38% hydrofluoric acid mixture was put into Teflon inner vessel in outer Teflon pressure vessel with a polypropylene jacket, and was decomposed by heating with a microwave oven for kitchen use. After cooling, the sample solution was diluted to 50ml with 10ml of (1+1) hydrochloric acid and water and analyzed by ICP-AES. The standard solutions for calibration contained 5% phosphoric acid, 0.8% hydrofluoric acid, 4% hydrochloric acid, 0.28mgSi/ml and 0.74mgAl/ml for matrices matching of the solution. This method was applied to the analysis of commercial mullite samples, and the results showed satisfactory reproducibility.
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