Naslov
Electroanalytical Study of Aluminium Fluoride Complexation in 2-Propanol-Water Mixtures

Autori
Radić, Njegomir ; Papa, Miljenko

Izvornik
Analytical Sciences (0910-6340) 11 (1995), 3; 425-429

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
potentiometry; fluoride-electrode; aluminum; nonaqueous media

Sažetak
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  (A1F63-)> 1028. 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 (/JO were calculated. The calculated average ( ')-values are 1031 and 1033, 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 AUV- complex formation, in the concentration range from 10-4 to 10-3 M.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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