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 acidhydrogen peroxide leaching is also described. Results for the determination of trace amounts of niobium in international standards of rocks and minerals are shown.
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