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

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

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60.2789p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 60, Issue 15, pp.2789-2799

Computer Science

2

Scientific paper

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: FeOH 2 + , SO 4 2- (log 1,1,1(intr) out = 8.3 ± 0.03) and FeOH 2 + , HSO 4 - (log 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.

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