Ion-exchange separation and spectrophotometric determination of trace amounts of niobium in silicate rocks

Abstract

A spectrophotometric determination of trace amounts of niobium in rocks and minerals is described. Elemental interferences emanating from the silicate rock matrix are discussed. An ion-exchange separation method is proposed in an attempt to avoid these interferences. A method involving sodium peroxide fusion and hydrochloric acid-hydrogen peroxide leaching is also described. Results for the determination of trace amounts of niobium in international standards of rocks and minerals are shown.