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A carbon paste electrode modified with a metal-organic framework of type MIL-101(Fe) for voltammetric determination of citric acid

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Abstract

A carbon paste electrode (CPE) modified with a metal-organic framework composite of type MIL-101(Fe) is described for determination of citric acid (CA). The electrochemical activity of the modified CPE was studied by cyclic voltammetry and differential pulse voltammetry. Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, N2 adsorption-desorption isotherms and X-ray powder diffraction were used for characterization of the MIL-101(Fe). Under optimized electrochemical conditions, the anodic peak current, best measured at working potentials around 0.02 V (vs. Ag/AgCl); decreases linearly in the 5.0 to 100 μM CA concentration range, and the detection limit is 4.0 μM (at S/N = 3). The electrode exhibits good selectivity for CA, with no significant interference in the wide pH range of 3.0 to 9.0. The electrochemical sensitivity of the MIL-CPE is −0.67 μA·μM−1·cm−2. The method was successfully applied to the determination of CA in some commercial beverages. The good recoveries (98–102%) and the agreement of data with those obtained by HPLC indicate the applicability of the method.

Schematic presentation of a new modified carbon paste electrode based on the metal-organic framework of type MIL-101(Fe) for the simple and sensitive determination of citric acid. The results show the MIL-101(Fe)-modified electrode to have good selectivity for citric acid and to enable real sample analysis.

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Acknowledgments

The authors express their gratitude to Shiraz University Research Council for the support of this work (grant no. 95GCU2M172254).

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  1. Department of Chemistry, Faculty of Science, Shiraz University, Shiraz, 71454, Iran

    Hamed Valizadeh, Javad Tashkhourian & Abdolkarim Abbaspour

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  1. Hamed Valizadeh
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Correspondence to Javad Tashkhourian.

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Valizadeh, H., Tashkhourian, J. & Abbaspour, A. A carbon paste electrode modified with a metal-organic framework of type MIL-101(Fe) for voltammetric determination of citric acid. Microchim Acta 186, 455 (2019). https://doi.org/10.1007/s00604-019-3585-4

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