Study of kinetic parameters and development of a voltammetric sensor for the determination of butylated hydroxyanisole (BHA) in oil samples

Thomas, Daniel; Rasheed, Zafna; Jagan, Jesny Siri; Kumar, Krishnapillai Girish

doi:10.1007/s13197-015-1796-1

Cited by 79 publications

(41 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Is was observed for TBHQ that at high scan rates, the separation between peak potentials increases linearly with increasing scan rates, and the anodic potential peak of BHA also have a linear relationship with the log of scan rate. From this linear dependence, the kinetic parameters of electron‐transfer coefficient (α) and the charge transfer constant ( k s ) were obtained by the Laviron's model . The slope of the lines are equal to 2.303RT/(1≅α)nF for anodic peaks and −2.303RT/αnF, for cathodic peaks, where n is the electron transfer number (2), F is 96500 C, R is 8.31 J mol −1 K −1 and T is 298 K. The values of the (α) anodic and cathodic for TBHQ, respectively, were found to be 0.50 and 1.18 for CBPE and 0.41 and 1.14 for CGE, and the average α were 0.84 and 0.78, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The α value for BHA was found to be 0.31 for CGE and 0.52 for CBPE. Taking into account the average α for TBHQ and the anodic α for BHA, the standard rate constant ( k s ) can be determined using the Equation 3 and 4, respectively.

true L o g k_{s} = α boldl boldo boldg (() 1 - α) + (() 1 - α) l o g α - l o g \frac{R T}{n F v} - α n F (() 1 - α) \frac{Δ normalE normalp}{2.3 R T}

true k_{S} = \frac{α_{a} n F v_{a}}{R T}

…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Feasibility of a Nano‐Carbon Black Paste Electrode for Simultaneous Voltammetric Determination of Antioxidants in Food Samples and Biodiesel in the Presence of Surfactant

et al. 2020

View full text Add to dashboard Cite

In this work, a simple and low‐cost method was developed for the simultaneous determination of the antioxidants tert‐butylhydroquinone (TBHQ) and butylated hydroxyanisole (BHA) in the presence of the cationic surfactant CPB by square wave voltammetry (SWV) technique using a carbon black paste electrode (CBPE). The performance of the method was investigated by varying parameters such as pH, electrolyte, and type and concentration of surfactant. Under the optimum conditions of 0.2 mol L−1 phosphate buffer (pH 7.0), 600.0 μmol L−1 of cetylpyridinium bromide surfactant and SWV operating parameters optimized through the Doehlert matrix, the method presented low limits of quantification for TBHQ and BHA (0.23 and 0.26 μmol L−1, respectively) and high precision in successive measurements. The proposed method was applied in mayonnaise, margarine and biodiesel and the accuracy of method was checked by the HPLC technique.

show abstract

Section: Resultsmentioning

confidence: 99%

true L o g k_{s} = α boldl boldo boldg (() 1 - α) + (() 1 - α) l o g α - l o g \frac{R T}{n F v} - α n F (() 1 - α) \frac{Δ normalE normalp}{2.3 R T}

true k_{S} = \frac{α_{a} n F v_{a}}{R T}

…”

Section: Resultsmentioning

confidence: 99%

Feasibility of a Nano‐Carbon Black Paste Electrode for Simultaneous Voltammetric Determination of Antioxidants in Food Samples and Biodiesel in the Presence of Surfactant

et al. 2020

View full text Add to dashboard Cite

show abstract

“…and log I =0.1299log v –4.514, R 2 =0.95 (peak IV.) indicate that the process is controlled by adsorption and kinetics, respectively . As emerged from the previous analyses, the mechanism of glucose oxidation on gold electrode starts with electrochemical adsorption of the glucose molecule on the surface by dehydrogenation (Eq.…”

Section: Resultsmentioning

confidence: 98%

Nanostructured Gold Microelectrodes for Non‐enzymatic Glucose Sensor

et al. 2019

View full text Add to dashboard Cite

A novel, highly stable, selective, and sensitive non‐enzymatic glucose sensor was developed by simple and effective modification procedure. The modification of gold microelectrodes by electrochemically deposited gold nanoparticles resulted in increase of surface area up to 37 %. The nanostructured surfaces of the gold microelectrodes obtained by different modifications were studied by confocal microscopy, atomic force microscopy, and scanning electron microscopy. The gold nanoclusters exhibit great electrocatalytic properties toward glucose with a wide linear range from 0.5 to 50 mM, with a limit of detection 218 μM, and sensitivity of 185.2 mA mM−1cm−2. Moreover, the modified microelectrodes display good reproducibility, stability, and selectivity in the presence of poisoning compounds. Due to the small dimensions of gold microelectrodes and a very small volume of the sample, the microelectrodes make a contribution to miniaturisation of the system.

show abstract

“…As an example, CVs at two scan rates (25 mV·s −1 and 100 mV·s −1 ) were performed to study the mechanism of electrode process occurring at the electrode surface of Cu exposed to cement extract solution ( Figure 14). It could be noted that with the exception of peak D (reduction of Cu 2 O to metallic Cu), no other peaks (A, B, C) have a linear dependence between the peak current (i p ) and the square root of the scanning speed (v 1/2 ) [69]. This behavior indicates that the processes, which correspond to peaks A, B and C, are not completely controlled by diffusion, because there is a small dependence of the position on the scan rate [70].…”

Section: Cyclic Voltammetry Measurementsmentioning

confidence: 99%

Copper Corrosion Behavior in Simulated Concrete-Pore Solutions

Bacelis

Véleva

Alpuche-Avilés

2020

Metals

View full text Add to dashboard Cite

The copper corrosion was studied for 30 days in two alkaline electrolytes: saturated Ca(OH)2 and cement extract, employed to simulate concrete-pore environments. Electrochemical Impedance Spectroscopy (EIS) and Cyclic Voltammetry were carried out at the open circuit potential (OCP), and potentiodynamic polarization (PDP) curves were performed for comparative purposes. Electrochemical current fluctuations, considered as electrochemical noise (EN), were employed as non-destructive methods. The tests revealed that sat. Ca(OH)2 is the less aggressive to the Cu surface, mainly because of the lower in one order pH. In consequence, the OCP values of Cu were more positive, the polarization resistance values were higher by one order of magnitude, and the anodic currents of Cu were lower than those in the cement extract. The analyzed EN indicated that the initial corrosion attacks on the Cu surface are quasi-uniform, resulting from the stationary persistent corrosion process occurring in both model solutions. XPS analysis and X-ray diffraction (XRD) patterns revealed that in sat. Ca(OH)2, a Cu2O/CuO corrosion layer was formed, which effectively protects the metallic Cu-surface. We present evidence for the sequential oxidation of Cu to the (+1) and (+2) species, its impact on the corrosion layer, and also its protective properties.

show abstract

Study of kinetic parameters and development of a voltammetric sensor for the determination of butylated hydroxyanisole (BHA) in oil samples

Cited by 79 publications

References 28 publications

Feasibility of a Nano‐Carbon Black Paste Electrode for Simultaneous Voltammetric Determination of Antioxidants in Food Samples and Biodiesel in the Presence of Surfactant

Feasibility of a Nano‐Carbon Black Paste Electrode for Simultaneous Voltammetric Determination of Antioxidants in Food Samples and Biodiesel in the Presence of Surfactant

Nanostructured Gold Microelectrodes for Non‐enzymatic Glucose Sensor

Copper Corrosion Behavior in Simulated Concrete-Pore Solutions

Contact Info

Product

Resources

About