Abstract

α-Hydroxyisobutyronitrile (acetone cyanohydrin, ACH) reacts with metals in ammoniacal medium and yields cyano complexes of negative charge. On this basis, Ni 2+, Cu 2+, Hg 2+, Zn 2+, Cd 2+ and Fe 2+ can be separated on a strongly basic anion exchanger in the chloride form as cyano complexes from Mg 2+, Ba 2+, Ca 2+, Na + and K +. The structure of complexes were examined on a strongly basic anion exchanger in the Cl − form and on a strongly acidic cation exchanger in the H + form. In slightly ammoniacal medium, Cu(CN) 4, Co(CN) 3.6 and Ni(CN) 3.2 were found. The complex adsorbs on the anion exchanger in the Cl − form as a divalent [NH 4Cu(CN) 4] 2− or a monovalent [NH 4Zn(CH) 4] − complex ion.

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