The methods commonly used for precipitating aluminum by 8-hydroxyquinoline from an acetic-acid solution, buffered with ammonium acetate, do not sufficiently define the conditions requisite for complete precipitation. The present article describes a method in which aluminum is precipitated as the oxyquinolate from a solution which has been partially neutralized with ammonium hydroxide, using bromcresol purple as an indicator. Results obtained in the separation of aluminum from beryllium and magnesium, and in the separation of beryllium in the presence of aluminum, iron, titanium, and zirconium, by the described procedure, are given.
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H. B. Knowles (1935) studied this question.