a-Aluminas are readily dissolved in concentrated phosphoric acid for analysis by inductively coupled plasma atomic emission spectrometry (ICP-AES). The dissolution rate is significantly faster than with concentrated HCI at high pressure or via fusion techniques. In addition t o the ICP-AES results obtained with these solvent systems, the results of NMR spectrometric analyses are presented, which permit the preliminary characterisation of the species in the phosphoric acid solutions.
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