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Potentiometric and spectroscopic studies of sulfate complexation at the goethite-water interface

Persson, Per LU and Lovgren, L. (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)
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publishing date
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
id
b66120ff-2a7c-4a3b-87e6-ffa49ab20ba0 (old id 4332677)
date added to LUP
2014-03-04 09:44:17
date last changed
2017-07-23 03:39:56
@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},
  volume       = {60},
  year         = {1996},
}