The sample is decomposed with nitric acid, perchloric acid and hydrofluoric acid to make hydrochloric acid (5 + 95) solution. Separate part of the solution, extract cobalt and nickel with NNP-butyl acetate in the medium of pH 6.8 ~ 8.4 in the presence of ammonium tartrate, and directly determine cobalt and nickel by organic phase spray. This method not only improves the sensitivity, but also because of the strong NNP selectivity, it can better overcome the problems of iron and manganese interference and matrix background absorption.
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