Une évaluation de deux méthodes pour déterminer la teneur en indium dans les minerais, les concentrés et les produits de traitement du zinc, soit la spectrophotométrie d'émission atomique et d'absorption atomique à la flamme

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.