Abstract
The sparingly soluble scarlet precipitate formed by the interaction of ferroin and antimony(V) in strong hydrochloric acid medium is soluble in nitrobenzene. The composition of the complex is [Fe(phen) 3] [SbCl 6] 2. The percentage extraction into nitrobenzene, determined by tracer techniques, reaches a maximum (98%) at 8–9 M hydrochloric acid. The advantages of this procedure over those employing dyes as reagents are discussed. Antimony(V) can be determined in the range 2.5–24μg ml -1. Interferences are described.
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