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Electrochemical determination of several biofuel antioxidants in biodiesel and biokerosene using polylactic acid loaded with carbon black within 3D-printed devices

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Abstract

Low oxidation stability is the main drawback of biodiesels and biokerosenes that is overcome by using antioxidants, which can be combined due to synergistic effects. This paper demonstrates that 3D-printed electrochemical devices can be applied to biofuel electroanalysis, including the monitoring of oxidation stability by quantifying the antioxidant content in biofuels. Fabrication requires 3D-printed acrylic templates at which a polylactic acid (PLA) filament with conducting carbon-black filling sensors is extruded by a 3D pen. The antioxidants butyl hydroxyanisole (BHA) and tert-butylhydroquinone (TBHQ) are the most employed additives in biodiesel production, and thus, their electrochemical behavior was investigated; 2,6-ditertbutylphenol (2,6-DTBP) was included in this investigation because it is commonly added to biokerosenes. The electrochemical surface treatment of the 3D-printed electrodes improved the current responses of all antioxidants; however, the electrochemical oxidation of TBHQ was clearly more affected by an electrocatalytic action shifting its oxidation towards less positive potentials (~200 mV), which resulted in a better separation of TBHQ and BHA oxidation peaks (+0.4 and +0.6 V vs Ag|AgCl, respectively). The oxidation of 2,6-DTBP occurred at more positive potentials (+1.2 V vs Ag|AgCl). The simultaneous determination of TBHQ and BHA by differential-pulse voltammetry resulted in linear responses in the range 0.5 and 175 μmol L−1 with limits of detection and quantification of 0.15 μmol L−1 and 0.5 μmol L−1, respectively. The presence of Fe3+, Cu2+, Pb2+, Mn2+, Cd2+, and Zn2+, even in high concentrations, did not interfere in the determination of TBHQ and BHA. The determination of 2,6-DTBP in biokerosene was achieved by cyclic voltammetry. All relative standard deviations (RSD) were lower than 6.0 %, indicating adequate precision of the methods. Spiked biofuel samples were analyzed (after dilution in electrolyte) and recovery values between 85 and 120% were obtained, which indicates absence of sample matrix effects.

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Funding

The authors are grateful to the Brazilian agencies CAPES (001), CNPq (427731/2018-6, 307271/2017-0, 163330/2020-4, and TWAS/CNPq 137634/2017-0), INCTBio (CNPq grant no. 465389/2014–7), and FAPEMIG (RED-00042-16, PPM-00640-16 and APQ-03141-18) for the financial support.

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Authors and Affiliations

  1. Institute of Chemistry, Federal University of Uberlândia, Uberlândia, Minas Gerais, 38400-902, Brazil

    Nélio I. G. Inoque, Afonso F. João, Lucas V. de Faria & Rodrigo A. A. Muñoz

  2. Ministry of Education and Human Development, Sussundenga Secondary School, Manica, Mozambique

    Nélio I. G. Inoque

  3. Department of Mathematics and Natural Science, Púnguè University, Chimoio, Mozambique

    Afonso F. João

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  1. Nélio I. G. Inoque
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  4. Rodrigo A. A. Muñoz
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Correspondence to Rodrigo A. A. Muñoz.

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Inoque, N.I.G., João, A.F., de Faria, L.V. et al. Electrochemical determination of several biofuel antioxidants in biodiesel and biokerosene using polylactic acid loaded with carbon black within 3D-printed devices. Microchim Acta 189, 57 (2022). https://doi.org/10.1007/s00604-021-05152-x

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