Potentiometric titration of poly(acrylic acid) in mixed counterion systems: Chemical binding of Cd ions

• Published in: Analytica chimica acta Vol. 369; no. 1; pp. 109 - 114
• Main Authors: Benegas, Julio C, Cleven, Rob F.M.J, van den Hoop, Marc A.G.T
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 10-08-1998; Elsevier
• Subjects: Applied sciences; Cadmium; Chemical binding; Exact sciences and technology; Organic polymers; Physicochemistry of polymers; Poly(acrylic acid); Polyelectrolyte; Potentiometry; Properties and characterization; Solution and gel properties; Polyelectrolyte; Cadmium; Chemical binding; Poly(acrylic acid); Potentiometry; Acidity constant; Cadmium nitrate; Equilibrium constant; Transition metal Compounds; Acrylic acid polymer; Electrostatic interaction; Potentiometric method; Chemical properties; Aqueous solution; Electrochemical titration
• ISSN: 0003-2670; 1873-4324
• DOI: 10.1016/S0003-2670(98)00219-0

Potentiometric titration curves of various Cd/poly(acrylic acid) systems have been obtained in order to study the cadmium poly(acrylic acid) interaction. The experimental data, in terms of p
K
a versus
α, is well described by taking into account chemical binding of the cadmium ions with the polymer and electrostatically bound potassium counterions as calculated by the counterion condensation approach. In this way, the speciation of both divalent and monovalent counterions in solution is readily calculated.