### Electroanalytical Study of Aluminum Fluoride Complexation in 2-Propanol-Water MixturesElectroanalytical Study of Aluminum Fluoride Complexation in 2-Propanol-Water Mixtures

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 Author Radic, Njegomir ♦ Papa, Miljenko Source J-STAGE Content type Text Publisher The Japan Society for Analytical Chemistry Language English
 Subject Keyword Potentiometry ♦ fluoride-electrode ♦ aluminum ♦ nonaqueous media Abstract Theoretical approaches to aluminum-ion determination by two potentiometric methods (potentiometric titration and analyte subtraction potentiometry) are discussed. The computed theoretical titration curves show that the equivalence point is signaled by a sufficiently large change in the potential only in media where aluminum forms a hexafluoride complex; the overall formation constant of this complex is $β(AlF_{6}^{3-})≥10^{28}.$ On the basis of the potentiometric titration and the known subtraction experiments in 2-propanol-water, buffered with acetate buffer (pH 5), the overall conditional constants (β′) were calculated. The calculated average β′-values are $10^{31}$ and $10^{33},$ depending on the vol% of organic solvent, 50% and 67%. In the mixtures having a vol% of organic solvent of 50% or 67%, both methods can be applied for the determination of aluminum, via $AlF_{6}^{3-}$ complex formation, in the concentration range from $10^{-4}$ to $10^{-3}M.$ ISSN 09106340 Learning Resource Type Article Publisher Date 1995-06-10 e-ISSN 13482246 Journal Analytical Sciences(analsci1985) Volume Number 11 Issue Number 3 Page Count 5 Starting Page 425 Ending Page 429