Computer Science
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1301l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 54, Issue 5, pp.1301-1306
Computer Science
8
Scientific paper
Acid/base reactions and Al(III) complexation at the goethite-solution interface have been investigated at 298.2 K in NaNO 3 solutions at a constant ionic strength of 0.1 M. Equilibrium measurements were performed as potentiometric titrations using a glass electrode. The experimental data were evaluated on the basis of the constant capacitance model. The acid/base properties are described by the equilibria and the intrinsic equilibrium constants: FeOH + H + FeOH + 2 ; log s 1,1,0( int ) = 7.47 ±0.02, and FeOH FeO - + H + ; log s -1,1,0( int ) = -9.51 ± 0.04. The specific capacitance was determined to be 1.28 F m -2 . Aluminium (III) complexation within the range 3.0 < -log [H + ] < 8.5 results in the formation of the monodentate species Fe-O-Al-OH + ( log s -2,1,1( int ) = -1.49 ± 0.04) and Fe-O-Al-(OH) 2 0 ( log s -3,1,1( int ) = -9.10 ± 0.08). Whereas the acid base reactions were fully reversible, the aluminium desorption was found to be extremely slow and showed poor reversibility.
Lövgren Lars
Schindler Paul W.
Sjöberg Staffan
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