title: Direct evidence for two interaction modes in adsorption of divalent metal ions to iminodiacetate-type chelating resins.
abstract: The adsorption curves of divalent metal ions (M2+) to an iminodiacetate(IDA)-type chelating resin (-L2-) under the condition of metal ions in excess against IDA groups clearly indicated the difference in contribution between two species. Copper and nickel are adsorbed only as [(-L)M(II)], while cadmium and calcium are adsorbed as [(-L)M(II)] and [(-LH)2M(II)]. Addition of salts may enhance the deprotonation of IDA groups, interfere with the adsorption as [(-LH)2M(II)], and yield remarkable changes in adsorption curves, depending on the metal ions.
authors.affiliation: Department of Applied Chemistry, Nagoya Institute of Technology, Gokiso, Showa, Japan. yuchi@ach.nitech.ac.jp
authors.forename: Akio
authors.initials: A
authors.lastname: Yuchi
authors.forename: Kouichi
authors.initials: K
authors.lastname: Mukaie
authors.forename: Yuka
authors.initials: Y
authors.lastname: Sotomura
authors.forename: Hiromichi
authors.initials: H
authors.lastname: Yamada
authors.forename: Hiroko
authors.initials: H
authors.lastname: Wada