Interphase distribution of zinc (II), cadmium (II), iron (III), cobalt (II) cations in system water - diantipyrylmethane - 2 - naphthalenesulfonic acid - ammonium thiocyanate is investigated. Extraction of thiocyanate complexes is realized by an anion exchange mechanism. Optimum conditions for extraction and extraction-photometric determination of iron (III) and cobalt (II) are found. The law of Ber is applied in an interval from 20 up to 150 mkg for Co2+ and from 10 up to 100 mkg for Fe3+. The technique is developed on a standard sample of nickel-91b.

Key words: extraction by diantipyrylmethanes, thiocyanate complexes of metal cations.