Two procedures are described for t he gravimetric determination of gallium in aluminum. One of these is based upon the separation of gallium from aluminum in sulph uric-acid solution by precipitation with cupferron. In this method, gallium is determined by difference in an oxide r esidue containing gallium, vanadium, titanium, and zirconium. The other procedure is based upon the separation of gallium from aluminum in hydrochloric-acid solution by extraction with ether. In this method, gallium is determined directly as the oxide Ga20a.
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J.A. Scherrer (1935) studied this question.