Improved anodic stripping voltammetric detection of zinc on a disposable screen-printed gold electrode

Silva, Sarah M. da; Squissato, André L.; Rocha, Diego P.; Vasconcellos, Maria L. S.; Ferreira, Rafael de Queiroz; Richter, Eduardo M.; Muñoz, Rodrigo A.A.

doi:10.1007/s11581-019-03379-6

“…In the context of industrial production waters, the sensors should perform in hundreds of ppb level and not be restricted to trace level. New advances in Screen-Printed Electrodes (SPE) 23 may offer such a possibility in terms of concentration range with similar sensitivity with the proposed sensors. However, SPEs have not yet been reported to function in real seawater samples.…”

Section: Resultsmentioning

confidence: 99%

Zinc detection in oil-polluted marine environment by stripping voltammetry with mercury-free nanoporous gold electrode

Clochard

¹

,

Oral

²

,

Wade

³

et al. 2022

Sci Rep

1

0

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Detection of Zn(II) in oil-polluted seawater via square-wave anodic stripping voltammetry (SW-ASV) utilizing thin gold electrodes sputtered onto nanoporous poly(acrylic acid)-grafted-poly(vinylidene difluoride) (PAA-g-PVDF) membrane is herein reported. Prior to SW-ASV, PAA grafted nanopores demonstrated to efficiently trap Zn(II) ions at open circuit. This passive adsorption followed a Langmuir law. An affinity constant of 1.41 L $$\upmu $$ μ mol$$^{-1}$$ - 1 and a maximum Zn(II) adsorbed mass q$$_{max}$$ max of 1.21 $$\upmu $$ μ mol g$$^{-1}$$ - 1 were found. Applied SW-ASV protocol implied an accumulation step (− 1.2 V for 120 s) followed by a stripping step (− 1.2 to 1 V; 25 Hz; step: 4 mV; amplitude: 25 mV; acetate buffer (pH 5.5)). It revealed a Zn redox potential at − 0.8 V (Ag/AgCl pseudo-reference). Multiple measurements in synthetic waters close to the composition of production waters exhibited a decreasing precision with the number of readings R (1.65$$\%$$ % (R = 2) and 6.56$$\%$$ % (R = 3)). These membrane-electrodes should be used as disposable. The intra-batch mean precision was 14$$\%$$ % (n = 3) while inter-batches precision was 20$$\%$$ % (n = 15). Linear and linear-log calibrations allow exploitation of Zn(II) concentrations ranging from 10 to 500 $$\upmu $$ μ g L$$^{-1}$$ - 1 and 100 to 1000 $$\upmu $$ μ g L$$^{-1}$$ - 1 respectively. The LOD was 4.2 $$\upmu $$ μ g L$$^{-1}$$ - 1 (3S/N). Thanks to obtained calibration, a detected Zn(II) content of 1 ppm in a raw production water from North Sea oil platform was determined.

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“…The activation of the modified electrode was performed by 10 cycles in 1 mol L −1 H 2 SO 4 solution to eliminate impurities that can hinder the adsorption of molecules, diminishing the reproducibility and stability of the modified surface [45][46][47].…”

Section: Electrodeposition Of Gold Nanoparticles On Carbon Electrodesmentioning

confidence: 99%

Development of an Electrochemical Immunosensor for Specific Detection of Visceral Leishmaniasis Using Gold-Modified Screen-Printed Carbon Electrodes

Martins

¹

,

Barbosa

²

,

Andrade

³

et al. 2020

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Visceral leishmaniasis is a reemerging neglected tropical disease with limitations for its diagnosis, including low concentration of antibodies in the serum of asymptomatic patients and cross-reactions. In this context, this work proposes an electrochemical immunosensor for the diagnosis of visceral leishmaniasis in a more sensitive way that is capable of avoiding cross-reaction with Chagas disease (CD). Crude Leishmania infantum antigens tested in the enzyme-linked immunosorbent assay (ELISA) were methodologically standardized to best engage to the sensor. The antibodies anti-Trypanosoma cruzi and anti-Leishmania sp. Present in serum from patients with diverse types of CD or leishmaniasis were chosen. A screen-printed carbon electrode modified with gold nanoparticles was the best platform to guarantee effective adsorption of all antigens so that the epitope of specific recognition for leishmaniasis occurred efficiently and without cross-reaction with the evaluated CD. The current peaks reduced linearly after the recognition, and still were able to notice the discrimination between different kinds of diseases (digestive, cardiac, undetermined Chagas/acute and visceral chronic leishmaniasis). Comparative analyses with ELISA were performed with the same groups, and a low specificity (44%) was verified due to cross-reactions (high number of false positives) on ELISA tests, while the proposed immunosensor presented high selectivity and specificity (100%) without any false positives or false negatives for the serum samples from isolated patients with different types of CD and visceral leishmaniasis. Furthermore, the biosensor was stable for 5 days and presented a detection limit of 200 ng mL−1.

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“…Thanks to its noteworthy stability, gold is widely used in the fabrication of SPEs. Some examples of screen‐printed gold electrodes (SPGEs) have been already reported for heavy metals detection [15–18]. Wan et al [17].…”

Section: Introductionmentioning

confidence: 99%

A Robust Electrochemical Sensor Based on Butterfly‐shaped Silver Nanostructure for Concurrent Quantification of Heavy Metals in Water Samples

Naseri

¹

,

Ghosh

²

,

Sarkar

³

et al. 2022

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Heavy metals in drinking water have become a severe threat to human health. Detection of heavy metals has been achieved by electrochemical sensors that are modified with complex nanocomposites; however, reproducibility of these sensors is still a big challenge when applied in commercial settings. Here, a simple, very robust, and sensitive electrochemical sensor based on a screen‐printed carbon electrode modified with butterfly‐shaped silver nanostructure (AgNS/SPCE) has been developed for the concurrent determination of cadmium (II), lead (II), copper (II), and mercury (II) in water samples. The electrochemical behavior of the modified electrodes was investigated using cyclic voltammetry and differential pulse anodic stripping voltammetry. The AgNS/SPCE showed distinct peak potentials and a significant increase in the peak currents for all heavy metals, attributed to the high electrical conductivity and electrocatalytic activity of the synthesized butterfly‐shaped AgNS. Moreover, the excellent stability and sensitivity towards simultaneous quantification of heavy metals have been obtained with detection limits of 0.4 ppb, 2.5 ppb, 7.3 ppb, and 0.7 ppb for Cd (II), Pb (II), Cu (II), and Hg (II), respectively. Besides, the constructed sensor was successfully applied to simultaneously quantify target heavy metals in spiked water samples. Owing to excellent sensitivity, high robustness, affordability, and fast response, the presented electrochemical sensor could be incorporated into a portable and miniaturized potentiostat device, making it a promising method for on‐site water analysis.

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Improved anodic stripping voltammetric detection of zinc on a disposable screen-printed gold electrode

Cited by 15 publications

References 65 publications

Zinc detection in oil-polluted marine environment by stripping voltammetry with mercury-free nanoporous gold electrode

Zinc detection in oil-polluted marine environment by stripping voltammetry with mercury-free nanoporous gold electrode

Development of an Electrochemical Immunosensor for Specific Detection of Visceral Leishmaniasis Using Gold-Modified Screen-Printed Carbon Electrodes

A Robust Electrochemical Sensor Based on Butterfly‐shaped Silver Nanostructure for Concurrent Quantification of Heavy Metals in Water Samples

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