Fabricating a new electrochemically modified pencil graphite electrode based on acetophenone (2,4-dinitrophenyl)hydrazone for determining selenium in food and water samples

Azizi, Zohreh; Babakhanian, Arash

doi:10.1039/c8ay01959b

Cited by 22 publications

(6 citation statements)

References 39 publications

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“…Therefore, the new nanoparticle film was considered more suitable for electrochemical determination. 42 Considering that the byproducts produced during the preparation of CDs may affect the preparation and performance of the modified electrodes, CDs modified bismuth-based electrodes were prepared using the dialysis purified CDs solution (Fig. S4).…”

Section: Resultsmentioning

confidence: 99%

Direct Electrodeposition of Carbon Dots Modifying Bismuth Film Electrode for Sensitive Detection of Cd²⁺ and Pb²⁺

Zhang

Cui

Zeng

et al. 2022

J. Electrochem. Soc.

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A sensitive, selective, and stable sensor for the simultaneous determination of Cd2+ and Pb2+ in aqueous solution has been developed based on the carbon dots (CDs) and Nafion-modified bismuth film glassy carbon electrode (GCE). High graphitized CDs prepared by the sulfuric acid-assisted hydrothermal synthesis were directly electrodeposited on the GCE surface by cyclic voltammetry. Compared with the conventional bismuth film electrodes, CDs greatly improved the electrochemical activity of the bismuth film electrode for the detection of Cd2+ and Pb2+. After decorating CDs, the surface impedance of the GCE was decreased from 10.9 kΩ to 4.84 kΩ. Meanwhile, the corresponding response currents of the Bi/GCE were increased over 7.4 and 2.4 times for Cd2+ and Pb2+ with a wide linear range of 0.05-0.50 mg/L, respectively. High sensitivity was obtained with the detection limits of 3.1 μg L-1 (Cd2+) and 2.3 μg L-1 (Pb2+). Moreover, good stability was obtained for the simultaneous determination of Cd2+ and Pb2+ in the practical underground water with the relative standard deviations less than 10%. The results indicated that the CDs-modified bismuth film electrode could potentially be applied to detect the heavy metal ion concentrations in practical environment.

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Section: Resultsmentioning

confidence: 99%

Direct Electrodeposition of Carbon Dots Modifying Bismuth Film Electrode for Sensitive Detection of Cd²⁺ and Pb²⁺

Zhang

Cui

Zeng

et al. 2022

J. Electrochem. Soc.

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“…The resulted modified electrode showed excellent stability, electrocatalytic activity with favorable electrochemical parameters for the reduction of Se(IV) to Se(0) in Britton-Robinson buffer (pH 2) at a potential of −0.85 V (vs. SCE). The electrochemical response for the above mentioned analyte was linear in the range of concentrations from 5 × 10 −8 to 1.1 × 10 −7 mol L −1 with a detection limit of 1.7 × 10 −8 mol L −1 if a square wave variant of stripping voltammetry is used before subsequent application to samples of milk and waste water from food industry [ 26 ].…”

Section: Modern Sensing Platforms For the Detection Of Selenium Bamentioning

confidence: 99%

Electroanalytical Techniques for the Detection of Selenium as a Biologically and Environmentally Significant Analyte—A Short Review

et al. 2021

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This short review deals with the properties and significance of the determination of selenium, which is in trace amounts an essential element for animals and humans, but toxic at high concentrations. It may cause oxidative stress in cells, which leads to the chronic disease called selenosis. Several analytical techniques have been developed for its detection, but electroanalytical methods are advantageous due to simple sample preparation, speed of analysis and high sensitivity of measurements, especially in the case of stripping voltammetry very low detection limits even in picomoles per liter can be reached. A variety of working electrodes based on mercury, carbon, silver, platinum and gold materials were applied to the analysis of selenium in various samples. Only selenium in oxidation state + IV is electroactive therefore the most of voltammetric determinations are devoted to it. However, it is possible to detect also other forms of selenium by indirect electrochemistry approach.

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“…So, the developed sensor can be used for the detection of Se (IV) and Ni (II) in real water. It is important to access inference from organic compounds too since natural water contains them [24,25]. We did the extraction of each organic compound from the sample and dried it.…”

Section: Calibration Curves and Detection Limitmentioning

confidence: 99%

Detection of Selenium and Nickel Metal Ion in Water Using Mn3O4-Cn-Modified Electrode

Abraham¹

2021

International Journal of Electrochemistry

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The present study reports the design of the Mn3O4-Cn electrode and its use for simultaneous detection of selenium and nickel in water. The designed electrode can be used as a convenient electrochemical device for on-site testing of Se (IV) and Ni (II) levels in affected regions. The best responses are obtained with 0.1 M phosphate buffer saline (PBS) and 5 mM Fe (CN)6 as supporting electrolyte. The scan rate and the number of cyclic repetitions have a great effect on peak shape and intensity. It is seen from our study that peak intensity is directly proportional to Se (IV) and Ni (II) concentrations in the range of 5 to 250 µg/L (correlation coefficients 0.952 and 0.984) when the optimized parameters are used. The detection limit of 0.533 µg/L Se (IV) and 0.718 µg/L for Ni (VI) with a response time of 18 s for 5–250 µg/L concentration is obtained, respectively. Enhanced analytical results for different water samples establish that the proposed method is appropriate for Se (IV) and Ni (II) detection. FESEM images confirm the Mn3O4-Cn nanocomposite formation on the electrode.

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Fabricating a new electrochemically modified pencil graphite electrode based on acetophenone (2,4-dinitrophenyl)hydrazone for determining selenium in food and water samples

Abstract: Determination of selenium compounds in air, soil, water, and food samples is of interest as selenium's bioavailability and toxicity depend on its concentration level.

Cited by 22 publications

References 39 publications

Direct Electrodeposition of Carbon Dots Modifying Bismuth Film Electrode for Sensitive Detection of Cd²⁺ and Pb²⁺

Direct Electrodeposition of Carbon Dots Modifying Bismuth Film Electrode for Sensitive Detection of Cd²⁺ and Pb²⁺

Electroanalytical Techniques for the Detection of Selenium as a Biologically and Environmentally Significant Analyte—A Short Review

Detection of Selenium and Nickel Metal Ion in Water Using Mn3O4-Cn-Modified Electrode

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Fabricating a new electrochemically modified pencil graphite electrode based on acetophenone (2,4-dinitrophenyl)hydrazone for determining selenium in food and water samples

Abstract: Determination of selenium compounds in air, soil, water, and food samples is of interest as selenium's bioavailability and toxicity depend on its concentration level.

Cited by 22 publications

References 39 publications

Direct Electrodeposition of Carbon Dots Modifying Bismuth Film Electrode for Sensitive Detection of Cd2+ and Pb2+

Direct Electrodeposition of Carbon Dots Modifying Bismuth Film Electrode for Sensitive Detection of Cd2+ and Pb2+

Electroanalytical Techniques for the Detection of Selenium as a Biologically and Environmentally Significant Analyte—A Short Review

Detection of Selenium and Nickel Metal Ion in Water Using Mn3O4-Cn-Modified Electrode

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Direct Electrodeposition of Carbon Dots Modifying Bismuth Film Electrode for Sensitive Detection of Cd²⁺ and Pb²⁺

Direct Electrodeposition of Carbon Dots Modifying Bismuth Film Electrode for Sensitive Detection of Cd²⁺ and Pb²⁺