Microchimica Acta

, 186:455 | Cite as

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

  • Hamed Valizadeh
  • Javad TashkhourianEmail author
  • Abdolkarim Abbaspour
Original Paper


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.

Graphical abstract

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.


MOFs Porous materials Sensor Electrochemistry Beverage Cyclic voltammetry Differential pulse voltammetry 



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

Compliance with ethical standards

The author(s) declare that they have no competing interests.

Supplementary material

604_2019_3585_MOESM1_ESM.docx (302 kb)
ESM 1 (DOCX 301 kb)


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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Chemistry, Faculty of ScienceShiraz UniversityShirazIran

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