Regularities in aluminum and indium chemisorption on chelating polymeric sorbents

The complexing properties of chelating polymeric sorbents (CPSs)--substitut ed (polystyrene) azapyrocatechols-are studied. With the goal of elucidating the effect of the structure and acidity of the functional groups of the so rbents on the parameters of Al3(+) and In3(+) chemisorption, correlations b etween the pK(OH') of the functional groups of the CPSs, on one hand, and t he pH(50) of chelation and the stability constants log K-st of the polychel ates, on the other, are found. These correlations enable the prediction of the physical and chemical parameters of sorbents and of metal sorption with the purpose of isolating and concentrating trace aluminum and indium from objects of various origins.