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Interaction of Molybdenum(VI) Oxyanions with +2 Metal Cations

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Abstract

The association of molybdenum(VI) oxyanions with metal cations was investigated in solutions of low ionic strength, such as those prevailing in most natural waters. Potentiometric titrations were carried out for the systems containing molybdenum(VI) anions and divalent metal cations (M = Mg, Ca, Sr, Ba, Mn, Fe, Co, Ni, Cu, Zn, Cd, Hg and Pb). This selection includes the major cations and some other cations of high environmental relevance. The interaction of iron(III) with Mo(VI) anions was also studied. At neutral and basic pH values and for those systems where the solubility of the molybdate salt is high enough, ionic species pairs such as [M(MoO4)] predominate. At acidic pH values, [M(HMoO4)]+ and [M(Mo7O24)]4– are formed, the latter species are only relevant for total molybdenum concentrations higher than 1 mmol·L−1. These results provide the basis for molybdenum speciation in natural aquatic systems, on which the environmental fate, bioavailability and toxicity of the element depend.

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Acknowledgments

We would like to thank Comisión Sectorial de Investigación Científica, CSIC (Programa de Apoyo a Grupos), and Agencia Nacional de Investigación e Innovación, ANII (Project FCE_1_2011_1_6491) from Uruguay, for financial support.

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Authors and Affiliations

  1. Cátedra de Química Inorgánica, Departamento Estrella Campos, Facultad de Química, Universidad de la República, CC 1154, Montevideo, Uruguay

    Julia Torres, Lorena Gonzatto, Guzmán Peinado, Carlos Kremer & Eduardo Kremer

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  1. Julia Torres
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  2. Lorena Gonzatto
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  3. Guzmán Peinado
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  4. Carlos Kremer
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Correspondence to Julia Torres.

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Torres, J., Gonzatto, L., Peinado, G. et al. Interaction of Molybdenum(VI) Oxyanions with +2 Metal Cations. J Solution Chem 43, 1687–1700 (2014). https://doi.org/10.1007/s10953-014-0231-y

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  • DOI: https://doi.org/10.1007/s10953-014-0231-y

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