Simultaneous, ultrasensitive detection of hydroquinone, paracetamol and estradiol for quality control of tap water with a simple electrochemical method

Autor(es)

Raymundo-Pereira, Paulo A. ^[1] ; Gomes, Nathalia O. ^[2] ; Machado, Sergio A. S. ^[2] ; Oliveira, Jr., Osvaldo N. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Inst Phys, CP 369, BR-13566590 Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, Sao Carlos Inst Chem, CP 369, BR-13566590 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 848, SEP 1 2019.
• Citações Web of Science: 0

Resumo

Real-time monitoring of possible contamination in the water supply network requires the deployment of large numbers of sensors for varied analytes, which would be economically viable only if simple methods and low-cost sensing units are available. In this paper, we demonstrate that carbon screen-printed electrodes (SPEs) can be used to determine simultaneously the presence of emerging pollutants (EP) hydroquinone (HQ), paracetamol (PARA) and estradiol (E2) in tap water, with detection limits of 185, 218 and 888 nmol L-1, respectively, within a linear range between 0.5 and 10.0 mu mol L-1. Ibis performance is competitive with high-performance liquid chromatography (HPLC), the gold-standard methodology for water analysis, being superior to any carbon-based electrochemical sensors in the literature. It was achieved with differential pulse voltammetry (DPV) using carbon SPEs pretreated through a simple procedure with cyclic voltammetry (CV) in 0.5 mol L-1 sulfuric acid solution. Pretreatment did not affect the electrode morphology but removed non-conducting residues from the printing ink, according to energy-dispersive X-ray (EDX) spectra obtained in scanning electron microscopy (SEM). Therefore, electrode conductivity increased as demonstrated in electrochemical impedance spectroscopy measurements. The pretreated SPEs were stable for at least 30 days and detection of the analytes was not affected by common interferents. Because the sensor fabrication and detection methods are simple, with potentially low-cost water analysis, the results presented here may inspire the design of sensor networks for monitoring water quality in the supply system and in the environment. (C) 2019 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 16/12759-0 - Desenvolvimento de uma metodologia eletroanalítica avançada para a quantificação dos hormônios 17b-estradiol e 17alfaetinilestradiol em amostras de águas de abastecimento, empregando eletrodos modificados com grafeno, nanopartículas de ouro e quantum dots
• Beneficiário: Sergio Antonio Spinola Machado
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/14262-7 - Filmes nanoestruturados de materiais de interesse biológico
• Beneficiário: Osvaldo Novais de Oliveira Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 16/01919-6 - Design e fabricação de dispositivos flexíveis nanoestruturados para detecção de biomarcadores
• Beneficiário: Paulo Augusto Raymundo Pereira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 19/01777-5 - Confecção de dispositivos eletroquímicos descartáveis compostos por nanoesferas ocas de carbono e nanofios de carbono decorados com nanopartículas de prata para a quantificação de interferentes endócrinos em amostras de água de abastecimento
• Beneficiário: Sergio Antonio Spinola Machado
• Modalidade de apoio: Auxílio à Pesquisa - Regular