Flexible Carbon Electrodes for Electrochemical Detection of Bisphenol-A, Hydroquinone and Catechol in Water Samples
by
Acelino C. de Sá 1,2, Simone C. Barbosa 1,2, Paulo A. Raymundo-Pereira 1
, Deivy Wilson 1, Flávio M. Shimizu 3, Maria Raposo 2,* and Osvaldo N. Oliveira Jr., Jr. 1,*
Acelino C. de Sá 1,2, Simone C. Barbosa 1,2, Paulo A. Raymundo-Pereira 1, Deivy Wilson 1, Flávio M. Shimizu 3, Maria Raposo 2,* and Osvaldo N. Oliveira Jr., Jr. 1,*
1
São Carlos Institute of Physics, University of São Paulo-USP, São Carlos, 13566-590 São Paulo CEP, Brazil
2
CEFITEC, Physics Department, Faculty of Science and Technology, Universidade Nova de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal
3
Department of Applied Physics, “Gleb Wataghin” Institute of Physics (IFGW), University of Campinas (UNICAMP), 13083-859 Campinas, São Paulo, Brazil
*
Authors to whom correspondence should be addressed.
Chemosensors 2020, 8(4), 103; https://doi.org/10.3390/chemosensors8040103
Received: 15 September 2020 / Revised: 13 October 2020 / Accepted: 14 October 2020 / Published: 17 October 2020
(This article belongs to the Special Issue Printed Chemical Sensors)
The detection of pollutant traces in the public water supply and aquifers is essential for the safety of the population. In this article, we demonstrate that a simple electrochemical procedure in acidic solution can be employed for enhancing the sensitivity of flexible screen-printed carbon electrodes (SPEs) to detect bisphenol-A (BPA), hydroquinone, and catechol, simultaneously. The SPEs were pretreated electrochemically in a H2SO4 solution, which did not affect their morphology, yielding high current signals with well separated oxidation peaks. The sensitivity values were 0.28, 0.230, and 0.056 µA L µmol−1 with detection limits of 0.12, 0.82, and 0.95 µmol L−1 for hydroquinone, catechol, and BPA, respectively. The sensors were reproducible and selective for detecting BPA in plastic cups, and with adequate specificity not to be affected by interferents from water samples. The simple, inexpensive, and flexible SPE may thus be used to detect emerging pollutants and monitor the water quality.
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Keywords:
flexible carbon electrodes; electrochemical sensor; emerging pollutants; bisphenol-A; hydroquinone and catechol; water samples
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MDPI and ACS Style
Sá, A.C.; Barbosa, S.C.; Raymundo-Pereira, P.A.; Wilson, D.; Shimizu, F.M.; Raposo, M.; Oliveira Jr., O.N., Jr. Flexible Carbon Electrodes for Electrochemical Detection of Bisphenol-A, Hydroquinone and Catechol in Water Samples. Chemosensors 2020, 8, 103.
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