The hydrolysis of Al3+ was studied in aqueous 1 mol L-1 NaNO3 solution at different concentrations (20 – 200 mmol L-1) and temperatures (283.15 –343.15 K) by potentiometry (ISE-H+, glass electrode). Many different speciation models were considered in the calculations and it was found that the best model is represented by the following species: Al(OH)2+, Al3(OH)45+, Al13(OH)327+. Hydrolysis constants and enthalpy changes at different temperatures are reported.
Cigala, R.M., De Stefano, C., Giacalone, A., Gianguzza, A. (2011). Speciation of Al3+ in fairly concentrated solutions(20-200 mmol L-1) at I = 1 molL-1 (NaNO3), in the acidic pH range, at different temperatures. CHEMICAL SPECIATION AND BIOAVAILABILITY, 23(1), 33-37 [10.3184/095422911X12971889727358].
Speciation of Al3+ in fairly concentrated solutions(20-200 mmol L-1) at I = 1 molL-1 (NaNO3), in the acidic pH range, at different temperatures
GIACALONE, Alba;GIANGUZZA, Antonio
2011-01-01
Abstract
The hydrolysis of Al3+ was studied in aqueous 1 mol L-1 NaNO3 solution at different concentrations (20 – 200 mmol L-1) and temperatures (283.15 –343.15 K) by potentiometry (ISE-H+, glass electrode). Many different speciation models were considered in the calculations and it was found that the best model is represented by the following species: Al(OH)2+, Al3(OH)45+, Al13(OH)327+. Hydrolysis constants and enthalpy changes at different temperatures are reported.
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