Abstract
Two methods for the determination of small amounts of indium in ores, concentrates and zinc processing products have been evaluated. A method involving the separation of indium from matrix elements by n-butyl acetate extraction as the bromide yields more accurate and precise results than a method based on the coprecipitation of indium with hydrous ferric oxide. For small amounts of indium, a flame atomic-emission finish gives greater accuracy and precision than an atomic-absorption finish. The enhancing effects of aluminum on the determination of indium by both flame atomic-emission and atomic absorption spectrophotometry in nitric and hydrochloric acid media have been studied and a possible mechanism is proposed to explain the anomalous behaviour observed in the absence and presence of potassium as an ionization suppressant.
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