Separation of some transition-metal ions on silica-immobilized 2-pyridinecarboxaldehyde phenylhydrazone.
A metal-ion extractant, prepared by chemical binding of 2-pyridinecarboxaldehyde phenylhydrazone on a silica support, is described and shown to be effective for use in separation and determination of trace amounts of iron, cobalt, nickel, and copper. Metal-ion sorption conforms to the Langmuir isotherm. The relative orders of the Langmuir constants K and the column retention-capacity factors k' for the four transition-metal ions are the same as the natural order of the stabilities predicted for their metal chelates: Fe(II) < Co(II) < Ni(II) < Cu(II).
Watanesk
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Department of Chemistry, Northern Illinois University, DeKalb, IL 60115, U.S.A.
Schilt
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