Abstract
A method for the determination of arsenic and antimony in niobium, with simultaneous determinations of Au, Cu and Mo, is described. The samples are irradiated for 12 h in a thermal neutron flux of 8 × 10 13 n cm -2 s -1 and then dissolved in hydrofluoric —nitric acid. After addition of various masking agents, and reduction with potassium iodide, As(III) and Sb(III) are extracted with diethylammoniumdiethyldithiocarbamate in chloroform. Before reduction, Au, Cu and Mo can be extracted as dithiocarbamates and determined. For samples of about 100 mg, the limits of detection are 10 pg g -1 for As, 20 pg g -1 for Sb, 0.8 pg g -1 for Au, 10 pg g -1 for Cu and 25 ng g -1 for Mo. Results are given for niobium samples of different grades of purity.
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