Chelation regularities in the series of chelating polymer sorbents and their complexes with vanadium, manganese, and chromium

Physical and chemical properties of substituted polystyrene-azosalicylic acids, newly synthesized chelating polymer sorbents (CPSs), are studied. Correlations are found between the pK(COOH) of the functional groups of the sorbent and the pH(50) of chelation with vanadium, manganese, and chromium, with the goal of studying (metal ion)-sorbent interactions. These correlations enable the prediction of the physical and chemical parameters of a sorbent and of the sorption of metal cations, targeted at concentrating and separating trace vanadium(IV), manganese(II), and chromium(III) from solutions and natural or technogenic (including environmental) objects.