Complexation reactions of phthalic acid and aluminium (III) with the surface of goethite

Details Complexation reactions of phthalic acid and aluminium (III) with the surface of goethite Complexation reactions of phthalic acid and aluminium (III) with the surface of goethite

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.3639l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 55, Issue 12, pp.3639-3645

Computer Science

2

Scientific paper

Complexation reactions of phthalic acid at the goethite-solution interface have been investigated in the absence and the presence of Al(III) in order to evaluate an equilibrium model applicable in chemical modelling. Phthalic acid was chosen as a model compound for natural organic substances. The study was performed as potentiometric titrations in 0.100 M NaNO 3 at 298.2 K using a glass electrode. Evaluation of experimental data was based on the constant-capacitance model ( K = 1.28 F m -2 ). Complexation of phthalic acid (H 2 L) at the surface of goethite is rather weak and results in the formation of mononuclear species, as described by the equilibria and intrinsic equilibrium constants (±3 ): FeOH + H 2 L FeLH + H 2 O ; log 0,1,0,1( int ) s = 6.68 (±0.05) and FeOH + H 2 L FeL - + H 2 O + H + ; log -1,1,0,1( int ) s = 0.35 (±0.06). In the presence of Al(III), the adsorption behavior of phthalic acid indicated formation of ternary surface complexes in the region 4 - log [ H + ] 7. Additional complexes occurring in the four-component system are described by the equilibria and intrinsic equilibrium constants: FeOH + Al 3+ + H 2 L FeOAlL + 3 H + ; log -3,1,1,1( int ) s = -2.7 (±0.29) and FeOH + Al 3+ + H 2 L + H 2 O FeOAl ( OH ) L - + 4 H + ; log -4,1,1,1( int ) s = -8.3 (±0.16).

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