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Separation of metals on ion-exchange resins by means of α-hydroxyisobutyronitrile as complexing agent

✍ Scribed by László Légrádi

Publisher
Elsevier Science
Year
1974
Tongue
English
Weight
392 KB
Volume
102
Category
Article
ISSN
1873-3778

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✦ Synopsis

a-Hydroxyisobutyronitrile (acetone cyanohydrin, ACH) reacts with metals in ammoniacal medium and yields cyano complexes of negative charge. On this basis, Ni2+, Cu2+, Hg2+, Zn2+, Cd2+ and Fe2+ can be separated on a strongly basic anion exchanger in the chloride form as cyano complexes from Mg2+, Ba2+, Ca2+, Na+ and K+. The structures 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),, Co(CN) 3,6 and Ni(CN)J.2 were found. The complex adsorbs on the anion exchanger in the Cl-form as a divalent [NH&u(CN)J2-or a monovalent [NH,Zn(CN),]' complex ion.

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