Experimental study of aluminum-acetate complexing between 60 and 200°c

Details Experimental study of aluminum-acetate complexing between 60 and 200°c Experimental study of aluminum-acetate complexing between 60 and 200°c

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.4561b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 21, pp.4561-4571

Computer Science

2

Scientific paper

The solubilities of bayerite and boehmite were measured as a function of pH and acetate concentration at temperatures from 60 to 200°C, to determine the stoichiometries and stability constants of aluminum-acetate complexes. Analysis of these solubility data indicate that the three aluminumacetate complexes, AlAcO 2+ , Al(OH) AcO + and Al(AcO) + 2 are significant. The logarithm of the stability constants of these complexes are found to be linearly related to the reciprocal of temperature over the range 60-200°C. The slopes of these relationships yield association enthalpies of 5 kJ/mol. Thermodynamic calculations indicate that acetate can markedly enhance the solubility of Al-bearing minerals in sedimentary basin fluids over the temperature range from 100 to 200°C, at pH < 5, but have little effect in solutions having higher pHs.

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