Article
Chemistry, Analytical
Yifei Zhang, Danlei Li, Richard G. Compton
Summary: We have developed a new and sensitive stripping voltammetric method for the detection of As(III) in aqueous solution using gold macroelectrode or gold nanoparticle-modified glassy carbon electrode (GCE). The method is based on underpotential deposition (UPD) of As ad-atoms and provides linear responses within the range of 0.01 μM to 0.1 μM or 0.005 μM to 0.1 μM for gold macroelectrodes and gold nanoparticle-modified electrodes, respectively. The method shows practical value with clear and discernable signals even at low concentrations of As(III), meeting the WHO limit for drinking water.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Tybur Q. Casuse-Driovinto, Ruben Rizo, Angelica Benavidez, Adrian J. Brearley, Jose M. Cerrato, Fernando H. Garzon, Enrique Herrero, Juan M. Feliu
Summary: The use of highly oriented Au(111) single crystal and thin film surfaces can improve the detection of arsenic (As) in water by reducing the variance in analyte electrode surface adsorption and desorption energies. An ultraflat Au(111) thin film exhibits a similar response to a bulk Au(111) single crystal and can be used to detect trace concentrations of As in water.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Analytical
Yifei Zhang, Richard G. Compton
Summary: A sensitive stripping voltammetry method using gold macroelectrodes based on underpotential deposition of As ad-atoms was developed for the selective detection of total arsenic in aqueous solution. This method showed linear responses for both As(III) and total arsenic and could detect concentrations as low as 0.01 mu M (0.8 mu g L-1), making it suitable for the detection of total arsenic concentrations in drinking water within the WHO threshold value of 0.13 mu M (10 mu g L-1).
Review
Biochemistry & Molecular Biology
Miroslav Rievaj, Eva Culkova, Damiana Sandorova, Zuzana Lukacova-Chomistekova, Renata Bellova, Jaroslav Durdiak, Peter Tomcik
Summary: Selenium, an essential trace element for animals and humans, can be toxic at high concentrations leading to selenosis. Electroanalytical methods, especially stripping voltammetry, are advantageous for selenium detection with very low detection limits. Working electrodes based on different materials have been applied for selenium analysis.
Article
Chemistry, Analytical
Thiago Martimiano do Prado, Lucas Gomes da Silva Catunda, Daniel Souza Correa, Sergio Antonio Spinola Machado
Summary: The study presents the synthesis of Ag/AgCl ink with low curing temperature for electrochemical sensors, characterized using various techniques. The ink showed potential for designing miniaturized electrochemical sensing devices.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Review
Chemistry, Analytical
Azhar Abbas, Hatem M. A. Amin
Summary: This review discusses the recent advances in the preparation of Ag NPs-based electrodes and their application in electroanalysis since 2010. It provides valuable guidance for electrochemists in developing novel electrochemical sensors by exploring various electrode modification approaches and the single particle electrochemistry method. Moreover, challenges and future perspectives for improving the performance of Ag NPs-based electrodes in sensing and electroanalysis are outlined.
MICROCHEMICAL JOURNAL
(2022)
Article
Chemistry, Analytical
Gul Sirin Ustabasi, Ismail Yilmaz, Mustafa Ozcan, Ebru Cetinkaya
Summary: Pencil graphite electrode modified with MWCNT and Bi3+ showed improved sensitivity and reduced charge transfer resistance in the simultaneous analysis of Pb2+, Cd2+, and Zn2+. This modification method offers effective electroanalytical performance with low time consumption and cost.
Article
Chemistry, Analytical
Paula Sebastian-Pascual, Maria Escudero-Escribano
Summary: The study evaluates the lead (Pb) underpotential deposition (UPD) on well-defined Cu electrode surfaces as a tool to analyze the surface state and determine the presence and distribution of domains on Cu catalysts. The voltammetric profile of Pb UPD is strongly sensitive to changes in the structure of the Cu electrode, allowing for the monitoring of the appearance of new defects and domains. Pb UPD can provide the electrochemical fingerprint of Cu catalysts and separate the contribution of different facets and defects in the surface structure.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Electrochemistry
Daniel E. Molina, Nathalie Wall, Haluk Beyenal, Cornelius F. Ivory
Summary: The developed FI-EQCM-ICP-OES technique allowed for studying the electrochemical recovery of silver with mass detection and elemental analysis. The results showed the composition of the stripped metal layer varied between pure silver and silver-copper alloy depending on the redox replacement time.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Electrochemistry
Baodan Zhang, Wei Wang, Cheng Liu, Lianhuan Han, Juan Peng, Alexander Oleinick, Irina Svir, Christian Amatore, Zhong-Qun Tian, Dongping Zhan
Summary: In this work, a simple and easily applicable voltammetric approach is described to characterize and measure the site-hopping surface diffusion of UPD metal adatoms on nanoelectrodes. By using nanoelectrodes, the major involvement of site-hopping surface diffusion of UPD Pb adatoms on polycrystalline gold was established and quantitatively characterized.
Article
Electrochemistry
Domen Obrez, Mitja Kolar, Nikola Tasic, Samo B. Hocevar
Summary: Copper electrodes have interesting characteristics for electrochemical stripping analysis and can be an alternative to mercury electrodes. Different types of copper-based electrodes were studied for the detection of trace metal ions. Most of the copper electrodes showed favorable performances for stripping voltammetry.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Physical
Alex Ricardo Silva Olaya, Franziska Kuehling, Christoph Mahr, Birthe Zandersons, Andreas Rosenauer, Joerg Weissmueller, Gunther Wittstock
Summary: Nanoporous gold (NPG) with less than 1% residual Ag content was studied as an electrocatalyst for the oxidation of methanol, formaldehyde, and formate. The surface structure and oxidation reaction of NPG can be controlled by adjusting the Ag content and potential. Ag has a significant impact on the onset potential and peak current density of the catalytic reaction.
Article
Chemistry, Analytical
Megumi Kasuno, Hitomi Osuga, Katsuya Shina, Takuya Yamazaki
Summary: A flow coulometric electroanalytical system was developed to determine the Pb(II) content with high efficiency and low detection limits. Selective determination of Pb(II) was successfully achieved by adjusting the electrodeposition potential.
Article
Materials Science, Multidisciplinary
Masoud Ghanei-Motlagh, Mehdi Baghayeri
Summary: In this study, nitrogen (N) and sulfur (S) co-doped carbon/sepiolite clay hybrid nanostructure was synthesized and exhibited excellent electrochemical sensing capabilities for Hg(II) detection. The sensor showed a linear range from 0.4 to 85.0 µg/L with a detection limit of 0.1 µg/L.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Review
Chemistry, Analytical
Aurelia Magdalena Pisoschi, Aneta Pop, Florin Iordache, Loredana Stanca, Liviu Bilteanu, Andreea Iren Serban
Summary: Antioxidants can prevent or delay the oxidation process, with primary and secondary antioxidants playing different roles. Carbon-based electrodes are widely used in electroanalysis due to their unique features.
Article
Chemistry, Analytical
Maria Madej, Katarzyna Fendrych, Radoslaw Porada, Mateusz Flacha, Jolanta Kochana, Boguslaw Bas
Summary: This paper presents a novel voltammetric sensor for sensitive and selective detection of AMT, based on FeZ-G/GCE surface modification, showing improved catalytic activity and linear response in different concentration ranges. The sensor was successfully applied for AMT determination in pharmaceutical, environmental water, and urine samples with high recovery rates.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Analytical
Maria Madej, Dariusz Matoga, Klaudia Skaznik, Radoslaw Porada, Boguslaw Bas, Jolanta Kochana
Summary: A voltammetric sensor based on glassy carbon electrode modification with a nanocomposite has been developed for the detection of citalopram. The fabricated hybrid material exhibits the properties of mixed ion-electron conductor and shows a linear response in three different concentration ranges of citalopram. It has been successfully applied for the determination of citalopram in pharmaceutical, environmental waters, and biological samples with satisfactory recoveries.
Article
Electrochemistry
Agnieszka Nosal-Wiercinska, Marlena Martyna, Mariusz Grochowski, Boguslaw Bas
Summary: For the first time, a novel cyclically renewable liquid silver amalgam film electrode (R-AgLAFE) has been used in studies of electrode processes under cap-pair conditions, showing a multi-phase mechanism with 2-thiocytosine catalyzing the electroreduction of Bi(III) ions. The obtained results confirm that R-AgLAFE is an attractive alternative to HMDEs for studying the cap-pair effect.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Engineering, Multidisciplinary
Radoslaw Porada, Katarzyna Fendrych, Boguslaw Bas
Summary: This study presents a new modified electrode for highly-sensitive determination of folic acid, with improved sensitivity and resolution compared to previous methods. The sensor showed reliable performance in the determination of folic acid in pharmaceuticals.
Article
Chemistry, Analytical
Radoslaw Porada, Katarzyna Fendrych, Boguslaw Bas
Summary: A novel and selective voltammetric sensor for vitamin B-6 was fabricated using environmentally friendly nanoporous natural zeolite exchanged with Ni2+ ions and conductive carbon black. The NiZCB-GCE exhibited superior properties confirmed by CV and EIS measurements, and was successfully applied to determine VB6 in various samples.
Article
Chemistry, Multidisciplinary
Radoslaw Porada, Boguslaw Bas
Summary: This paper presents a simple and effective method for the determination of vitamins B1 and B3 using Continuous Wavelet Transform and differentiation of voltammograms. The proposed methodology allows for impartial and reproducible results consistent with analytical chemistry criteria.
MONATSHEFTE FUR CHEMIE
(2021)
Article
Electrochemistry
Katarzyna Jedlinska, Radoslaw Porada, Magdalena Strus, Boguslaw Bas
Summary: This study presents for the first time an easily-operated and environmentally friendly, reusable voltammetric sensor called the bi-band bismuth microelectrode (b-BBimE), which combines the advantages of both micro- and macroelectrodes. The sensor's unique arrangement of microelectrodes on the lateral surface enables easy preparation, use, and a consistent flow of depolarizer to the electrodes. The use of bismuth as an electrode material allows for a wide range of applications. The sensor demonstrated excellent reproducibility, stability, a wide range of potentials, and linear response. Testing with Eu3+ ions, riboflavin, and folic acid confirmed the advantages of the sensor. The calculated RSD values for Eu3+ concentrations fell within acceptable ranges for both short-term and long-term reproducibility.
ELECTROCHEMISTRY COMMUNICATIONS
(2022)
Article
Electrochemistry
Maria Madej, Justyna Lipinska, Ryszard Kapica, Aleksandra Kedzierska-Sar, Ewelina Fratczak, Jolanta Kochana, Boguslaw Bas, Jacek Tyczkowski
Summary: This work demonstrates a pioneering application of plasma-enhanced chemical vapor deposition (PECVD) in the direct modification of commercially available screen-printed carbon electrodes (SPCEs) with polymerized acrylonitrile (pp-AN) nanofilms. The study investigates the effect of different plasma power levels and deposition times on the films' characteristics and the electrochemical properties of the sensors. A pp-AN film deposited at a power of 10 W with a thickness of approximately 60 nm exhibited the highest sensitivity and favorable electrochemical properties.
ELECTROCHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Analytical
Szymon Wojcik, Filip Ciepiela, Boguslaw Bas, Malgorzata Jakubowska
Summary: The work introduces innovative quadruple disk voltammetric electrodes made of iridium, platinum, and iridium-platinum, which are specifically designed for analyzing samples with complex organic compositions. The electrodes utilize noble metal wires tightly wrapped in a silver rod, allowing each wire to function as an individual sensor. By combining the electrode responses from the different metals, the iridium-platinum sensor can expand its application range and be used as an electronic tongue. Experimental results demonstrate the successful profiling of seasonal variations in honey samples collected from a beekeeping facility in Poland using these single and combined noble metal electrodes. By employing differential pulse voltammetry without any reagents, the obtained data were analyzed using principal component analysis and an optimized variable selection procedure. The best classification results for the 12 honeys were achieved using a multimetallic electrode. A deep convolutional neural network model achieved 100% accuracy in correctly classifying the honeys in the training and validation sets. This study highlights the potential of quadruple disk noble metal electrodes as a valuable tool for voltammetric profiling and suggests that the strategy involving deep learning can be further developed.
Article
Food Science & Technology
Rados law Porada, Katarzyna Fendrych, Jolanta Kochana, Bogus law Bas
Summary: A low-cost and highly selective voltammetric method for the determination of vitamins B-2, B-9, B-12, and B3 using a Ni-zeolite/carbon black modified glassy carbon electrode was presented. The proposed sensor showed an enhancement effect on reduction signals of the studied vitamins. The developed protocol was successfully applied for the direct determination of the above-mentioned vitamins in dietary supplements, multivitamin juices and energy drinks, and food products without laborious sample preparation.
Article
Chemistry, Analytical
Szymon Wojcik, Valentin Mirceski, Boguslaw Bas, Malgorzata Jakubowska
Summary: This study demonstrates that quadruple-disk electrodes with innovative designs have the potential to function as a single sensor and act as a voltammetric electronic tongue for food profiling. The use of the double-sampled differential square-wave voltammetry technique significantly increases resolution and enables extraction of hidden information in measuring signals. The selection of the optimal sensor and methodology for interpreting current samples was based on four clustering validity indices.
Article
Engineering, Environmental
Katarzyna Fendrych, Radoslaw Porada, Boguslaw Bas
Summary: A novel, unique, mercury-free, and user-friendly voltammetric sensor of Ni(II) based on glassy carbon electrode modified with zeolite(MOR)/graphite(G)/dimethylglyoxime(DMG) composite (MOR/G/DMG-GCE) was fabricated and applied for highly selective, ultra-trace determination of nickel ions. The chemically active MOR/G/DMG nanocomposite enabled the selective and effective accumulation of Ni(II) ions as the DMG-Ni(II) complex. The developed protocol showed linear response in the concentration range of 0.86-19.61 μg L-1 and 0.57-15.75 μg L-1 for accumulation times of 30 s and 60 s, respectively, with a limit of detection of 0.18 μg L-1 (3.04 nM) and sensitivity of 0.202 μA L μg-1.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Chemistry, Analytical
Radoslaw Porada, Nadine Wenninger, Christina Bernhart, Katarzyna Fendrych, Jolanta Kochana, Boguslaw Bas, Kurt Kalcher, Astrid Ortner
Summary: This work presents the targeted modification of carbon paste (CP) by adding conductive graphene oxide (GO) and mesoporous natural zeolite with Ni2+ cations (NiZ), which enhances the electrocatalytic properties. A univariate optimization showed that 5% (w/w) of NiZ and GO in the CP led to a threefold increase in peak current, decreased overpotential of paracetamol (PAR) oxidation, low background current, and high signal-to-noise ratio. The CPE/NiZ/GO sensor exhibited a linear response in the PAR concentration range of 0.004 to 0.12 mg L-1, with a low limit of detection of 0.0012 mg L-1 (0.0078 μM) and high stability (RSD = 3%). The proposed method demonstrated good selectivity and robustness to interference, and was successfully applied for the determination of PAR in pharmaceuticals, human urine, and serum.
MICROCHEMICAL JOURNAL
(2023)
Article
Electrochemistry
Katarzyna Fendrych, Radoslaw Porada, Boguslaw Bas
Summary: In this paper, an ultrasensitive and highly selective analytical method for the determination of mesalazine was developed and successfully applied in pharmaceuticals, environmental waters, and biological fluids. The method exhibited a significant enhancement effect in the oxidation peak current of mesalazine.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Analytical
Maria Madej, Agata Trzcinska, Justyna Lipinska, Ryszard Kapica, Maciej Fronczak, Radoslaw Porada, Jolanta Kochana, Boguslaw Bas, Jacek Tyczkowski
Summary: This study proposes an original electrochemical sensing platform, which modifies screen-printed electrodes with plasma polymerized acrylonitrile (pp-AN) nanofilms. The modified sensors exhibit excellent chemical stability, durability, high signal-to-noise ratio, and the ability to standardize. The sensor is successfully applied to the determination of bupropion, showing linear voltammetric response and low detection limit. The satisfactory recoveries and good precision obtained for environmental and biological samples confirm the usefulness of the sensor for various sample analyses.