Multivariate optimization of square wave voltammetry using bismuth film electrode to determine atrazine

Bia, G.; Borgnino, Laura; Ortiz, Patrícia I.; Pfaffen, Valeria

doi:10.1016/j.snb.2014.07.003

Cited by 37 publications

(14 citation statements)

References 41 publications

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“…Membrane absorber efficiently separates the sulfite contained in wine and avoids the presence of other compounds, which can interfere these measurements. Sulfite can be quantified by square wave voltammetry using one calibration curve 8,9,10,11 , obtaining very similar values to those obtained for the same sample by the modified Monier-Williams method (aspiration method) and the Ripper method.…”

mentioning

confidence: 64%

Electrochemical Method for Sulfite Determination in Wines by Electrochemical Response Using a Membrane Absorber System

Arce¹,

Báez²,

Muena³

et al. 2016

J. Chil. Chem. Soc.

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This research demonstrates how the sulfite content can be measured by cyclic voltammetry using a previously reported membrane absorber system, which separates efficiently sulfite present in wine. Results obtained show notably similar values to those obtained for the same wine samples using modified MonierWilliams method (aspiration method) and Ripper method. The membrane absorber system allows the release of the free SO 2, and can be used to determine the sulfur dioxide present in juices and other foods that contain high concentrations of phenols, polyphenols and other structurally related compounds that act as interferers in the electrochemical oxidation of sulfite. The absorber solution allows a direct measurement without change in pH or added electrolyte, facilitating the determination of great amounts of samples from diverse wines using only one calibration curve. In this way, a system that allows the detection of sulfite and that can be used in vineyards is obtained.Finally, the method was assessed on linearity, sensitivity, accuracy, reproducibility and repeatability, obtaining values that account for the applicability of the method.

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mentioning

confidence: 64%

Electrochemical Method for Sulfite Determination in Wines by Electrochemical Response Using a Membrane Absorber System

Arce¹,

Báez²,

Muena³

et al. 2016

J. Chil. Chem. Soc.

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“…Atz quantification was determined by square wave voltammetry (SWV) with a glassy carbon electrode modified with a bismuth film. The SWV parameters and the best chemical conditions for Atz quantification were reported in Bia et al 40 All of the electrochemical experiments were carried out with an Autolab potentiostat.…”

Section: Sorption Experimentsmentioning

confidence: 99%

Humic Acid–Fe(Hydr)oxide Composites Supported on Montmorillonite: Synthesis, Characterization, and Atrazine Adsorption

et al. 2017

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Much progress has been made involving the interaction of atrazine (Atz) with natural geosorbents like Fe(hydr)oxides, organic matter, and clay minerals. However, the properties of the humic acid–Fe(hydr)oxides-clay composites differ from their individual member phases, exerting an influence on the adsorption capacity and stability of the system. In this work, the evaluation of Atz adsorption onto humic acid–Fe(hydr)oxide supported on montmorillonite (HA–FeM) was performed. A combination of the X-ray diffraction pattern and batch adsorption experiments at different pH and ionic strength conditions were performed. The identification of the surface groups involved in the interaction FeM–Atz was carry out using X-ray photoelectron spectroscopy. The presence of Fe(hydr)oxides and humic acid improve the adsorption capacity of montmorillonite. Acidic pH and high ionic strength conditions further increases the adsorption. The heterogeneity of the surface sites and cooperative effect contributes to the adsorption process. However, the hydrophobic character of the herbicide is the key factor controlling adsorption. The results obtained from this work give insights about the adsorption mechanism of Atz onto humic acid Fe(hydr)oxides-clay composites and provide information about the potentiality of this type of material to be used to remove organic pollutants present in the aquatic environment.

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“…This work presents a systematic evaluation of different factors to determine if they have a significant impact on the analytical performance of in situ FEs. In order to determine significance, a factorial design (commonly also referred to as an experimental design) was employed [27,28]. A combination of analytical parameters regarding the linear concentration range, accuracy, precision, LOQ, and sensitivity was considered simultaneously with the analytical performance of the method.…”

Section: Introductionmentioning

confidence: 99%

The Use of Factorial Design and Simplex Optimization to Improve Analytical Performance of In Situ Film Electrodes

Finšgar

Jezernik

2020

Sensors

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This work presents a systematic approach to determining the significance of the individual factors affecting the analytical performance of in-situ film electrode (FE) for the determination of Zn(II), Cd(II), and Pb(II). Analytical parameters were considered simultaneously, where the lowest limit of quantification, the widest linear concentration range, and the highest sensitivity, accuracy, and precision of the method evidenced a better analytical method. Significance was evaluated by means of a fractional factorial (experimental) design using five factors, i.e., the mass concentrations of Bi(III), Sn(II), and Sb(III), to design the in situ FE, the accumulation potential, and the accumulation time. Next, a simplex optimization procedure was employed to determine the optimum conditions for these factors. Such optimization of the in situ FE showed significant improvement in analytical performance compared to the in situ FEs in the initial experiments and compared to pure in situ FEs (bismuth-film, tin-film, and antimony-film electrodes). Moreover, using the optimized in situ FE electrode, a possible interference effect was checked for different species and the applicability of the electrode was demonstrated for a real tap water sample.

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Multivariate optimization of square wave voltammetry using bismuth film electrode to determine atrazine

Cited by 37 publications

References 41 publications

Electrochemical Method for Sulfite Determination in Wines by Electrochemical Response Using a Membrane Absorber System

Electrochemical Method for Sulfite Determination in Wines by Electrochemical Response Using a Membrane Absorber System

Humic Acid–Fe(Hydr)oxide Composites Supported on Montmorillonite: Synthesis, Characterization, and Atrazine Adsorption

The Use of Factorial Design and Simplex Optimization to Improve Analytical Performance of In Situ Film Electrodes

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