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Formation and Stability of Cadmium(II)/Phytate Complexes by Different Electrochemical Techniques. Critical Analysis of Results

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Abstract

In the present work the stability constants of various cadmium(II)/phytate (Phy) species were determined at T=298.15 K in NaNO3(aq) at I=0.1 mol⋅L−1 by DP-ASV (Differential Pulse Anodic Stripping Voltammetry) and by potentiometric titrations using an ISE-Cd2+. Cyclic voltammograms were also recorded to check the electrochemical behavior of cadmium in the presence of phytate. The results were analyzed together with previous data determined by ISE-H+ measurements. Data obtained were used to provide an exhaustive speciation scheme for the phytate/cadmium(II) system at different conditions, as well as a comprehensive representation of the binding ability of phytate toward cadmium(II). Different pL50 values {a previously proposed empirical parameter, expressed as −log 10 C Phy, where C Phy is the total phytate concentration necessary to bind 50% cadmium(II)} were also calculated by modeling its dependence on pH.

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Authors and Affiliations

  1. Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica, Università di Messina, Salita Sperone, 31, 98166, Messina (Vill. S. Agata), Italy

    Concetta De Stefano, Gabriele Lando, Demetrio Milea & Silvio Sammartano

  2. Dipartimento di Chimica Inorganica e Analitica “Stanislao Cannizzaro”, Università di Palermo, Viale delle Scienze, 90128, Palermo, Italy

    Alberto Pettignano

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  1. Concetta De Stefano
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  2. Gabriele Lando
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  3. Demetrio Milea
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  4. Alberto Pettignano
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  5. Silvio Sammartano
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Correspondence to Concetta De Stefano.

Additional information

For the last contribution to this series see ref. [1].

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De Stefano, C., Lando, G., Milea, D. et al. Formation and Stability of Cadmium(II)/Phytate Complexes by Different Electrochemical Techniques. Critical Analysis of Results. J Solution Chem 39, 179–195 (2010). https://doi.org/10.1007/s10953-009-9493-1

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  • DOI: https://doi.org/10.1007/s10953-009-9493-1

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