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Cu2+ ion-sensitive surface on graphite electrodes

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Abstract

A new electrochemical interface based on polyacrylic acid (PAAcid) immobilized in a Nafion® polymeric matrix on graphite screen-printed electrodes for detecting copper is presented. The copper is retained in the surface due to the capacity of the polyacid to chelate metals, and quantified using square wave voltammetry. The response was characterized by spectroscopic techniques (UV-vis-IR), which confirmed the chelation from the Cu2+ ions by the acid. A calibration curve is presented, showing good linearity and repeatability and its usefulness as a sensor. The range of operation goes from 15 to 50 μM, with a detection limit of 12 μM, making the sensor useful for measurements in environmental samples (after a preconcentration step) and in drinking water.

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Acknowledgments

This work was partially supported by UBA, CONICET, ANPCyT, and OPCW. L. M. and G. G. are research staff of CONICET. I. P. acknowledges CONICET for his postdoctoral fellowship. The authors wish to thank Jorge Diebra and Paula Orellano for getting the real seawater sample and Leonardo Carlos Autelli for getting the real river water sample.

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Authors and Affiliations

  1. INQUIMAE – Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad Universitaria, Pabellón 2, 1428, Buenos Aires, Argentina

    Ignacio Pedre, Lucila Paula Méndez De Leo & Graciela Alicia González

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  1. Ignacio Pedre
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  2. Lucila Paula Méndez De Leo
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  3. Graciela Alicia González
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Correspondence to Ignacio Pedre or Graciela Alicia González.

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Pedre, I., Méndez De Leo, L.P. & González, G.A. Cu2+ ion-sensitive surface on graphite electrodes. Anal Bioanal Chem 411, 7761–7770 (2019). https://doi.org/10.1007/s00216-019-02142-0

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