Abstract
A simple, rapid, accurate, and reliable method of simultaneous determination of arsenic, germanium, phospohrus, and silicon is reported. The method involves first, the determination of germanium as the phenylfluorone complex and its selective extraction with isoamyl alcohol. Arsenic and phosphorus are determined in the remaining aqueous phase by selective formation of the arseno- and phosphomolybdic acids after polymerization of soluble silica with perchloric acid followed by the selective extraction of the phosphomolybdic acid in the presence of arsenomolybdic acid by isobutyl acetate. Silicon is a determined by a differential procedure after selective destruction of arseno- and phosphomolybdic acids in the presence of silicomolybdic acid. Arsenic, silicon, and phosphorus are determined as their heteropoly blues, the latter after direct reduction of the phosphomolybdic acid in isobutyl acetate.
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