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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


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