Chelating resin
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Chelating resins (or chelating sorbents) are usually perceived as s subgroup of ion exchange resins. However, in the case of chelating resins counter ions are bound to resin by coordinate covalent bond or by its combination with electrostatic interactions. While the case of ion exchange, electrostatic force between oppositely charged functional group and ion in solution plays the main role. The interaction of functional group (ligand) of chelating resin and metal (in form of cation or oxoanion) is selective with respect to the nature of the metal. It allows selective removal of target metals via suitable functional groups of chelating resins.
Chelating resins have the same bead form and polymer matrix as usual ion exchangers. They are mainly based on crosslinked polystyrene.
Typical functional groups of chelating resins are:
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