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Speciation and equilibria in the H+-Al3+ - polyacrylic acid system
Umeå University, Faculty of Science and Technology, Department of Chemistry.
2018 (English)In: Monatshefte fuer Chemie, ISSN 0026-9247, E-ISSN 1434-4475, Vol. 149, no 2, p. 423-429Article in journal (Refereed) Published
Abstract [en]

Equilibria between Al3+ and the polyelectrolyte polyacrylic acid (PAA) were studied in 0.1 M NaCl medium at 25 A degrees C (M = mol dm(-3)). The measurements were performed as precise potentiometric titrations in which OH- was in most cases generated coulometrically. The total concentration of Al(III) and PAA varied within the limits 6.23 x 10(-5)-2.01 x 10(-4) M and 7.20 x 10(-4)-1.12 x 10(-3) M, resp., with a 4-18 fold excess of ligand. The value of - log{[H+]/mol dm(-3)} varied between 3 and 5-7, the upper limit set by drifting EMF potentials caused by the onset of a precipitation reaction. The constant capacitance model was utilized to model the experimental data. With the objective of finding a model as simple as possible that gives an acceptable fit to data, the two species AlPAA(2+) and Al(OH)(2)PAA are postulated. The polyelectrolyte effect resulting in pH-dependent formation constants is demonstrated. Furthermore a comparison between the stability constant of the 1:1 complexes of Al3+ with acrylate(-) and PAA(-), respectively, shows the logK value of the latter to be five units higher and is ascribed to particular properties of the polyelectrolyte.

Place, publisher, year, edition, pages
2018. Vol. 149, no 2, p. 423-429
Keywords [en]
Stability constants, Carboxylic acids, Acidity, Potentiometric titrations, Surface complexation delling, Constant capacitance model
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-145596DOI: 10.1007/s00706-017-2096-4ISI: 000425536700022OAI: oai:DiVA.org:umu-145596DiVA, id: diva2:1194189
Available from: 2018-03-29 Created: 2018-03-29 Last updated: 2018-06-09Bibliographically approved

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Sjöberg, Staffan

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