8-hydroxyquinoline22 (oxine) is a w

8-hydroxyquinoline22 (oxine) is a well-charac
terized and versatile chelating organic ligand which
can form covalent compounds with a number of
metal ions under controlled pH. It has been immobilized
on a variety of supports such as glass
beads23, silica gel24, polystyrene divinylbenzene25,
silicon tube26, and ionic imprinted polymer27; thus
becoming suitable to be used with sorbents in metal
analysis.