Electrochemical Determination of Catechol Using a Disposable Printed Electrode with Conductive Ink Based on Graphite and Carbon Black

Catechol (CT) is a phenolic compound widely used in various industrial sectors, but it is toxic; thus, there is a need for methods that aim to identify and quantify the existence of residues of this material in the environment. In this study a disposable printed electrochemical sensor was developed...

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Bibliographic Details
Published in:Analytica 2024-06, Vol.5 (2), p.250-262
Main Authors: de Oliveira, Sthephane Pereira, de Oliveira Cândido, Thaís Cristina, Pereira, Arnaldo César, da Silva, Daniela Nunes
Format: Article
Language:English
Subjects:
Carbon
Carbon black
Carbonaceous materials
Catechol
Cellulose acetate
Chemical sensors
Chromatography
conductive ink
Drinking water
electrochemical sensor
Electrodes
Electrolytes
Graphite
Nail polishes
Phenols
Polyethylene terephthalate
Polyvinyl alcohol
Screen printing
Sensors
Silver chloride
Square waves
water
Water sampling
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Summary:Catechol (CT) is a phenolic compound widely used in various industrial sectors, but it is toxic; thus, there is a need for methods that aim to identify and quantify the existence of residues of this material in the environment. In this study a disposable printed electrochemical sensor was developed as an effective alternative for determining CT in water samples. The electrode, called SPEC, was manufactured using the screen-printing method using polyethylene terephthalate (PET) as a support, in which a conductive ink based on carbonaceous materials was used to print the working and auxiliary electrodes and a silver/silver chloride of ink on the reference electrode. The optimal ratio for the conductive ink was 6.25% carbon black, 35.42% graphite, and 58.33% nail polish. The ink obtained was characterized by scanning electron microscopy (SEM). The assessment of the effect of pH on the redox process showed Nernstian behavior (0.057 V pH−1), indicating that the process involves the same number of protons and electrons. Under optimized conditions, with 0.2 mol L−1 acetate buffer at pH 5.0, and by square wave voltammetry, the sensor presented sensitivity values of 0.31 μA L μmol−1, a detection limit of 5.96 μmol L−1, and a quantification limit of 19.87 μmol L−1. The sensor was applied to determine CT in tap water samples, and the results showed recoveries between 97.95 and 100.17%.
ISSN:2673-4532
2673-4532
DOI:10.3390/analytica5020016