Abstract
The results of an investigation on the interactions between phytate ion (myo-inositol hexaphosphate, Phy) and some lanthanoid cations (La3+, Nd3+, Sm3+, Dy3+, and Yb3+) are reported. The stability constants of various LnH j Phy species (Ln = generic lanthanoid) were determined by potentiometry (ISE-H+ glass electrode) in NaClaq at I = 0.15 mol dm−3 and t = 25 °C, and the corresponding formation enthalpies by calorimetric titration. The thermodynamic data obtained were used to provide a speciation scheme for the lanthanoid(III)–phytate systems at different temperatures. The sequestering ability of this ligand toward Ln3+ was also evaluated by calculation of pL50 values (the total concentration of ligand necessary to bind 50% of a cation present in trace amounts) under different conditions, and equations were formulated to model their dependence on temperature and pH.
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We thank University of Messina (PRA) for financial support.
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Speciation of phytate ion in aqueous solution. Last contribution to this series: Ref. [1].
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Crea, F., De Stefano, C., Milea, D. et al. Thermodynamic data for lanthanoid(III) sequestration by phytate at different temperatures. Monatsh Chem 141, 511–520 (2010). https://doi.org/10.1007/s00706-010-0303-7
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DOI: https://doi.org/10.1007/s00706-010-0303-7