Constantes de formation des complexes hydroxydés de l'aluminium en solution aqueuse de 20 a 70°C |
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Authors: | Yves Couturier Gil Michard Gérard Sarazin |
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Institution: | 1. Laboratoire de Chimie de Coordination, Université de Reims, B.P. 347, 51062 Reims Cedex, France;2. Laboratoire de Géochimie des Eaux, (Groupe du LA 196), Université Paris VII, F.75251 Paris Cedex 05, France |
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Abstract: | Stability constants of hydroxocomplexes of Al(III):Al(OH)2+ and A1(OH)4? have been measured in the 20–70°C temperature range by reactions involving only dissolved species. The stability constant of the first complex ion is studied by measuring pH of solutions of aluminium salts at several concentrations. of aluminate ion is deduced from equilibrium constants of the reaction between the trioxalato aluminium (III) complex ion and Al3+ in acid medium, and between the same complex ion and A1(OH)4? in alkaline medium. The K values and the associated ΔH are and ΔH1 = 11.8 Kcal; and ΔH4 = 42.45 Kcal. These last results are not in agreement with the values of recent tables for and of Al3+ and Al(OH)4?. We suggest a consistent set of data for dissolved and solid Al species and for some aluminosilicates. |
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