Potentiometric and spectroscopic studies of sulfate complexation at the goethite-water interface
(1996) In Geochimica et Cosmochimica Acta 60. p.2789-2799- Abstract
- The complexation of sulfate ions at the goethite-water interface has been studied by equilibrium measurements at 298.2 +/- 0.5 K and by infrared spectroscopy. A unified set of data from potentiometric titrations and batch adsorption experiments were evaluated according to an extended Constant Capacitance Model. The obtained equilibrium model consists of two outer-sphere complexes: = FeOH2+, SO42- (log beta(1,1,1(intr)(out)) = 8.3 +/- 0.03) and drop FeOH2+, HSO4- (log beta(2,1,1(intr)(out)) = 13.5 +/- 0.07) and an inner capacitance, C-1, of 4.5 and an outer capacitance, C-2, of 1.8. The outer-sphere model was confirmed by the infrared data and adsorption experiments at different ionic strengths. Furthermore, the infrared measurements... (More)
- The complexation of sulfate ions at the goethite-water interface has been studied by equilibrium measurements at 298.2 +/- 0.5 K and by infrared spectroscopy. A unified set of data from potentiometric titrations and batch adsorption experiments were evaluated according to an extended Constant Capacitance Model. The obtained equilibrium model consists of two outer-sphere complexes: = FeOH2+, SO42- (log beta(1,1,1(intr)(out)) = 8.3 +/- 0.03) and drop FeOH2+, HSO4- (log beta(2,1,1(intr)(out)) = 13.5 +/- 0.07) and an inner capacitance, C-1, of 4.5 and an outer capacitance, C-2, of 1.8. The outer-sphere model was confirmed by the infrared data and adsorption experiments at different ionic strengths. Furthermore, the infrared measurements provided direct evidence for protonation of the sulfate ions at the interface. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4332677
- author
- Persson, Per LU and Lovgren, L.
- publishing date
- 1996
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Geochimica et Cosmochimica Acta
- volume
- 60
- pages
- 2789 - 2799
- publisher
- Elsevier
- external identifiers
-
- scopus:0030483035
- ISSN
- 0016-7037
- DOI
- 10.1016/0016-7037(96)00124-X
- language
- English
- LU publication?
- no
- additional info
- 15
- id
- b66120ff-2a7c-4a3b-87e6-ffa49ab20ba0 (old id 4332677)
- date added to LUP
- 2016-04-01 11:48:16
- date last changed
- 2022-04-05 05:17:28
@article{b66120ff-2a7c-4a3b-87e6-ffa49ab20ba0, abstract = {{The complexation of sulfate ions at the goethite-water interface has been studied by equilibrium measurements at 298.2 +/- 0.5 K and by infrared spectroscopy. A unified set of data from potentiometric titrations and batch adsorption experiments were evaluated according to an extended Constant Capacitance Model. The obtained equilibrium model consists of two outer-sphere complexes: = FeOH2+, SO42- (log beta(1,1,1(intr)(out)) = 8.3 +/- 0.03) and drop FeOH2+, HSO4- (log beta(2,1,1(intr)(out)) = 13.5 +/- 0.07) and an inner capacitance, C-1, of 4.5 and an outer capacitance, C-2, of 1.8. The outer-sphere model was confirmed by the infrared data and adsorption experiments at different ionic strengths. Furthermore, the infrared measurements provided direct evidence for protonation of the sulfate ions at the interface.}}, author = {{Persson, Per and Lovgren, L.}}, issn = {{0016-7037}}, language = {{eng}}, pages = {{2789--2799}}, publisher = {{Elsevier}}, series = {{Geochimica et Cosmochimica Acta}}, title = {{Potentiometric and spectroscopic studies of sulfate complexation at the goethite-water interface}}, url = {{http://dx.doi.org/10.1016/0016-7037(96)00124-X}}, doi = {{10.1016/0016-7037(96)00124-X}}, volume = {{60}}, year = {{1996}}, }