Voltammetric Determination of Molybdenum Using Polymer Film Modified Pencil Graphite Electrodes

A novel, simple, rapid, inexpensive, highly sensitive voltammetric method developed for determining ferric ions with quercetin in water samples and iron supplements using a disposable bare pencil graphite electrode is described. The limit of detection and analytical ranges for the ferric ions were 3.6 nM and 17.9–716.0 nM, respectively. The results with the water samples were compared with those obtained from a potentiometric auto‐titration system, and the method's accuracy was tested using certified reference material. The complex stoichiometry and electrode reaction were also systematically investigated with UV‐visible spectrophotometry, 1H‐NMR spectroscopy and voltammetry.

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“…Next, following our previous research, the electron transfer coefficient (

α

) was calculated according to Eq. 1 [34, 35]:

true α = \frac{47.7}{n (|| E_{p} - E_{p / 2})} m V

…”

Section: Resultsmentioning

confidence: 99%

Voltammetric Method for Determining Ferric Ions with Quercetin

et al. 2021

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“…44,45 All EIS data and findings were found to be compatible with the literature. 28,42,43 The conductivity values of each polymer film-modified electrode greatly increase compared to aPGE from the obtained R s values. Besides, due to the non-uniformity of the polymer, the resistance of the polymer film (R f ) is higher in the coating carried out in NaOH than that in the presence of pH 7 PBS.…”

Section: Surface Characterization Of the Ptrt/apgementioning

confidence: 93%

Electrocatalytic Determination of Uric Acid with the Poly(Tartrazine)-Modified Pencil Graphite Electrode in Human Serum and Artificial Urine

Liv,

Portakal,

Çukur

et al. 2023

ACS Omega

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A novel electrocatalytic sensing strategy was built for uric acid (UA) determination with an exceptionally developed poly(tartrazine)-modified activated pencil graphite electrode (pTRT/aPGE) in human serum and artificial urine. The oxidation signal of UA at 275 mV in pH 7.5 phosphate buffer solution served as the analytical response. Cyclic voltammetry, electrochemical impedance spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy were used to characterize the sensing platform, which was able to detect 0.10 μM of UA in the ranges of 0.34–60 and 70–140 μM. The samples of human serum and artificial urine were analyzed by both the pTRT/aPGE and the uricase-modified screen-printed electrode. The results were statistically evaluated and compared with each other within the confidence level of 95%, and no significant difference between the results was found.

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“…It is observed that PGE contains aluminum (1.2%) due to the aluminum oxide in the structure of pencil graphite in addition to carbon (96.2%) and oxygen (2.6%) (Figure S5A). 44 With the activation of bare PGE, the amount of oxygen increased approximately 3 times (7.9%) and sodium (0.5%), phosphorus (0.3%), and potassium (0.5%) appeared probably due to the phosphate buffer (KH 2 PO 4 + NaOH) and KCl present in the activation solution (Figure S5B). As expected, the amount of carbon (97.2%) increased and the amount of oxygen (2.2%) decreased after the electropolymerization.…”

Section: Sample Preparation Procedurementioning

confidence: 99%

Signal-Enhanced Electrochemical Determination of Quercetin with Poly(chromotrope fb)-Modified Pencil Graphite Electrode in Vegetables and Fruits

Liv

Karakuş

2023

ACS Omega

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A novel signal-enhanced electrochemical sensing strategy was constructed for quercetin determination with a peculiarly developed poly(chromotrope fb)-modified activated pencil graphite electrode in vegetables and fruits. The oxidation signal of quercetin at 118 mV in an alcoholic solution served as the analytical response. The produced platform, characterized by cyclic voltammetry, electrochemical impedance spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Xray photoelectron spectroscopy, could detect 1.9 nM of quercetin in the range of 0.01−1.2 μM. The extracted quercetin contents of red onion, red cabbage, cranberry, black mulberry, black raisin, and carob were determined by both the developed method and UV− visible spectroscopy. The results were statistically evaluated at the 95% confidence level, and no significant difference between the results was found.

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Voltammetric Determination of Molybdenum Using Polymer Film Modified Pencil Graphite Electrodes

Cited by 16 publications

References 30 publications

Voltammetric Method for Determining Ferric Ions with Quercetin

Voltammetric Method for Determining Ferric Ions with Quercetin

Electrocatalytic Determination of Uric Acid with the Poly(Tartrazine)-Modified Pencil Graphite Electrode in Human Serum and Artificial Urine

Signal-Enhanced Electrochemical Determination of Quercetin with Poly(chromotrope fb)-Modified Pencil Graphite Electrode in Vegetables and Fruits

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