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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 2
BKCSDE 29(2)
February 20, 2008 

Gallium(III) Ion Hydrolysis under Physiological Conditions
Brahim Hacht
Gallium(III), Hydrolysis, Stability constants, Potentiometry, Physiological conditions
The hydrolysis of gallium(III) has been studied using potentiometric techniques under physiological conditions of temperature 37 °C and ionic strength 0.15 mol·dm?3 NaCl and at different metal ion concentrations. Changes in pH were monitored with a glass electrode calibrated daily in hydrogen ions concentrations. The titration data within the pH range of 2.5-9.99 were analyzed to determine stability constants of hydroxide species using the SUPERQUAD program. Several different species were considered during the calculation procedure and the following hydroxides have been characterized: Ga(OH)3, Ga(OH)4? Ga3(OH)112?, Ga4(OH)11+ and Ga6(OH)153+. Speciation calculations based on the determined constants were then used to simulate the species distribution.
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