Computer Science
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.1823s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 7, pp.1823-1831
Computer Science
1
Scientific paper
Aluminum hydroxide solubility experiments were performed at 50°C using the method of May et al . (1979b). The shift observed by May at 25°C between acidic and alkaline solution was also observed in our experiments. Infrared spectra of solids separated from solutions show that the low solubility values observed in alkaline medium can be related to the formation of a new solid phase: bayerite (or nordstrandite) ( pK * s 4 = 13.4 at 50° C ) in the presence of initial gibbsite. A second set of experiments was performed in solutions containing fluoride ions in the 10 -4 -10 -3 M concentration range. Fluorocomplexes are important in acidic solution; Al(OH) m F p mixed complexes can be important in the minimum of Al solubility when total fluoride exceeds 10 -3 M. We propose values of thermodynamic data for Al(OH) 2 F 2 - , Al(OH)F 3 - , Al(OH) 2 F 0 dg and for aluminum trifluoride solid. The difference of aluminum hydroxide solubility between acidic and alkaline medium is still observed.
Michard Gil
Sanjuan Bernard
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