Journal
MICROCHIMICA ACTA
Volume 186, Issue 7, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-019-3585-4
Keywords
MOFs; Porous materials; Sensor; Electrochemistry; Beverage; Cyclic voltammetry; Differential pulse voltammetry
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Funding
- Shiraz University Research Council [95GCU2M172254]
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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, N-2 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 0.02V (vs. Ag/AgCl); decreases linearly in the 5.0 to 100M CAconcentration range, and the detection limit is 4.0M (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 -0.67AM(-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.
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