Experimental and Computational Methods for Studying Multicomponent Equilibria. II. An Automated System for Precision emf Titrations

Ginstrup, Olle

doi:10.1080/10739147208543344

Cited by 46 publications

(10 citation statements)

References 14 publications

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“…From these results, conditions to avoid significant particle dissolution can be defined. The potentiometric titrations were performed using an automatic system for precise emf titrations described by Ginstrup . Calibration of the glass electrode was carried out on a concentration scale in each titration in an acid aluminum solution before ligand solution was added.…”

Section: Methodsmentioning

confidence: 99%

Inner-Sphere and Outer-Sphere Complexation of a Polycarboxylic Acid at the Water−Boehmite (γ-AlOOH) Interface: A Combined Potentiometric and IR Spectroscopic Study

et al. 1998

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Speciation and equilibria of 1,2,4,5-benzenetetracarboxylate (pyromellitate) at the water−boehmite (γ-AlOOH) interface were studied in 0.1 M Na(Cl) at 298 K. Surface equilibrium analyses were based upon potentiometric and adsorption measurements in the range 4.5 < pH < 10.0. To characterize the surface complexes at the molecular level, attenuated total reflectance infrared spectra were recorded. The IR data provided information on the structure and composition of the complexes. This information could then be used to constrain the thermodynamic surface complexation model. The acid/base properties of pyromellitate in solution and its complexation with Al(III) were also studied by means of potentiometric titrations in 0.1 M Na(Cl) at 298 K. The results of these measurements were primarily used to investigate the effect of pyromellitate on the dissolution of boehmite. In aqueous solution Al(III) forms a series of mononuclear complexes, namely, AlHL, AlL-, and Al(OH)L2-. No indication of polynuclear complexes was found within the concentration ranges studied. IR spectra of pyromellitate sorbed at the water−boehmite interface suggested the existence of one dominating surface complex over a wide pH range (4.4 ≤ pH ≤ 8.1). The IR spectroscopic characteristics of this complex were in agreement with an outer-sphere nonprotonated pyromellitate ion. No evidence was found for protonation of the sorbed ion. Thus, the nonprotonated form is greatly stabilized at the interface as compared to the speciation in the aqueous solution. The IR data also showed some indications of a second minor surface complex. This was tentatively assigned to an inner-sphere species. According to the constraints provided by the IR data, the potentiometric and adsorption data were modeled with two surface complexes, ⋮AlOH2 +L4- (outer-sphere) and ⋮AlL- (inner-sphere). The extended constant capacitance model was used to account for the electrostatic effects at the interface. The agreement between the experimental data and the model was satisfactory. Furthermore, the model was also in agreement with the minor changes observed in the IR spectra as a function of pH.

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Section: Methodsmentioning

confidence: 99%

Inner-Sphere and Outer-Sphere Complexation of a Polycarboxylic Acid at the Water−Boehmite (γ-AlOOH) Interface: A Combined Potentiometric and IR Spectroscopic Study

et al. 1998

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“…The titrations were carried out using an automatic system for precise e.m.f. measurements (Ginstrup, 1973). The measurements of pH were performed using a glass electrode (Ingold type 201-NS) and an Ag,AgCl-reference electrode using the cell -RE Խ 0.1 mol/L M NaNO 3 equilibrium solution Խ MEϩ where RE is the reference electrode of the composition Ag, AgCl 0.09 mol/L NaNO 3 , 0.01 mol/L NaCl, ME built in a Wilhem bridge (with a J-shaped tip), ME denotes the glass electrode and the equlibrium solution contains the goethite suspension in 0.1 mol/L NaNO 3 .…”

Section: Titrationsmentioning

confidence: 99%

Structures and stabilities of Cd(II) and Cd(II)-phthalate complexes at the goethite/water interface

Boily

Sjöberg

Persson

2005

Geochimica et Cosmochimica Acta

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“…Potentiometric titrations were performed with an automatic system designed and built at the department of Chemistry, Umeå University (Ginstrup, 1973). The cell arrangement, similar to that described by Forsling et al (1952), was immersed in an oil thermostat at 25.00 ± 0.05°C.…”

Section: Titrationsmentioning

confidence: 99%

A solubility and surface complexation study of a non-stoichiometric hydroxyapatite

Bengtsson

Shchukarev

Persson

et al. 2009

Geochimica et Cosmochimica Acta

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Experimental and Computational Methods for Studying Multicomponent Equilibria. II. An Automated System for Precision emf Titrations

Cited by 46 publications

References 14 publications

Inner-Sphere and Outer-Sphere Complexation of a Polycarboxylic Acid at the Water−Boehmite (γ-AlOOH) Interface: A Combined Potentiometric and IR Spectroscopic Study

Inner-Sphere and Outer-Sphere Complexation of a Polycarboxylic Acid at the Water−Boehmite (γ-AlOOH) Interface: A Combined Potentiometric and IR Spectroscopic Study

Structures and stabilities of Cd(II) and Cd(II)-phthalate complexes at the goethite/water interface

A solubility and surface complexation study of a non-stoichiometric hydroxyapatite

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