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Title: Equilibrium studies on interactions of rare earth ions with phytic acid
Authors: Siddiqi, K S
Shah, S A
Aqra, Fathi M A M
Tabassum, S
Zaidi, S A A
Benlian, O
Issue Date: May-1993
Publisher: NISCAIR-CSIR, India
Abstract: The interaction between phytic acid and trivalent rare earth metal ions, viz., Ce3+, Pr3+, Nd3+, Sm3+, Gd3+, Tb3+, Dy3+ and HO3+ has been investigated potentiometrically at 25ᵒC. The proton-ligand stability constants (pK) of phytic acid and the stability constants (logK) of metal complexes formed in aqueous medium (μ = 0.1 M NaClO4) have been evaluated. The results indicate that eight protons of phytic acid are highly acidic, two are weakly acidic and two very weakly acidic, titrable in the pH ranges 1.2-4.9, 5.0-8.15 and 8.3-11.0 respectively. The stability of each phytic acid-lanthanide ion complex decreases with an increase in pH and follows the usual trend through the series.
Page(s): 421-423
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.32A(05) [May 1993]

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