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Complexation Studies of N, N′-ethylenedi-L-cysteine with Some Metal Ions

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Abstract

As part of a search for environmentally friendly metal chelating ligands, the stability constants of N, N′-ethylenedi-L-cysteine (EC) complexes with Ca(II), Cu(II), Mg(II) and Mn(II) were determined by potentiometry with a glass electrode in aqueous solutions containing 0.1 mol⋅L−1 KCl at 25 °C. Final models are proposed. For the Ca(II)–EC system, the overall stability constants are log 10 β CaHL=14.53±0.03, log 10 β CaL=4.79±0.01 and log 10 β CaL2=8.38±0.04. For the M(II)–EC systems, where M=Cu(II) or Mg(II), the overall stability constants are log10 β CuHL=31.19±0.02 and log 10 β CuL=27.02±0.06 for Cu(II), and are log 10 β MgHL=14.84±0.02 and log 10 β MgL=6.164±0.008 for Mg(II). For the Mn(II)–EC system, the overall stability constant is log 10 β MnL=10.12±0.01.

Metal–chelate speciations simulations showed that EC is an efficient chelating agent for Cd(II), Co(II), Cu(II), Ni(II), Pb(II) and Zn(II) for pH≥7.

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Authors and Affiliations

  1. REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516, Caparica, Portugal

    M. Teresa Barros & Rui M. Pinto

  2. REQUIMTE—Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, 4200-465, Porto, Portugal

    João Martins, Mónica S. Santos & Helena M. V. M. Soares

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  1. M. Teresa Barros
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  2. João Martins
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  3. Rui M. Pinto
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  4. Mónica S. Santos
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  5. Helena M. V. M. Soares
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Correspondence to Helena M. V. M. Soares.

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Barros, M.T., Martins, J., Pinto, R.M. et al. Complexation Studies of N, N′-ethylenedi-L-cysteine with Some Metal Ions. J Solution Chem 38, 1504–1519 (2009). https://doi.org/10.1007/s10953-009-9463-7

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  • DOI: https://doi.org/10.1007/s10953-009-9463-7

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