Voltammetric determination of estrone based on the enhancement effect of surfactant and a MWNT film electrode

Yang, Chao; Sang, Qiuzhang; Zhang, Shenghui; Huang, Wensheng

doi:10.1016/j.msec.2009.01.024

Cited by 19 publications

(8 citation statements)

References 28 publications

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“…The displacement potential of the analytes was influenced by the concentration of H + ions, thus enabling the elucidation and proposal of a reaction mechanism (Figure .e) from the electrochemical response. In this way, it is possible to observe that the values of the angular coefficients of the oxidation potential curve vs pH are close to −0.0590, associating such behavior to a Nerstian system, in which it is suggested that the number of electrons involved in the reaction oxidation is equal to the number of protons (H + ) .…”

Section: Resultsmentioning

confidence: 52%

Total Determination of Estrogenic Phenolic Compounds in River Water Using a Sensor Based on Reduced Graphene Oxide and Molecularly Imprinted Polymer

2018

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The contamination of water and wastewater by emerging pollutants, due to the anthropogenic activities, are an environmental problem that generates several negative impacts. In this range of species, steroids have gaining notoriety because their action of endocrine‐disruption. In this work, they are called estrogenic phenolic compounds (EPCs): estrone (E1), estradiol (E2), ethinyl estradiol (EE2) and estriol (E3), for determination using an electrochemical sensor based on reduced graphene oxide (rGO) and molecularly imprinted polymer (MIP). The analytical method developed, allied with the experimental and operational optimizations, proved to be effective for the total quantification of the EPCs in river water. The method shows sensitivity of 1.12 μA/μmol L−1, detection limit of 26.8 nmol L−1 and linear range of 0.16–15 μmol L−1. The similar electrochemical behavior of the four compounds studied (E1, E2, EE2 and E3) and the efficiency of the modified composite (rGO, MIP) in the fabrication of the sensor resulted in high electrical conductivity and selective adsorptivity, respectively.

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Section: Resultsmentioning

confidence: 52%

Total Determination of Estrogenic Phenolic Compounds in River Water Using a Sensor Based on Reduced Graphene Oxide and Molecularly Imprinted Polymer

2018

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“…It is also observed that the potential and the intensity of the anodic peak current are shown to be dependent on the pH of the medium, that is, peak potentials move towards negative values with an increasing pH. In this way, it is possible to observe that the value of the coefficient of the curve of oxidation potential vs. pH (0.0560) is considerably close to 0.0590, associating such behavior to a Nerstian system, in which it is suggested that the number of electrons involved in the oxidation reaction is equal to the number of protons (H + ) [42]. This is confirmed by the oxidation mechanism proposed in the literature (Figure 13), which suggests that EE oxidizes in a 1:1 ratio of electrons and protons, an event occurring in the hydroxyl of the EE molecule bound to carbon 1 [5,43].…”

Section: Influence Of Ph On Ee Oxidationmentioning

confidence: 85%

Development of Electrochemical Sensor Based on Carbonaceal and Metal Phthalocyanines Materials for Determination of Ethinyl Estradiol

2019

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This work describes the development of an electrochemical sensor that was used in the determination of ethinyl estradiol (EE) in pharmaceutical formulations, river water, and milk using the square wave voltammetry technique. Studies were carried out using different carbonaceous materials (multiwalled carbon nanotubes, reduced graphene oxide Reduced graphene oxide, graphite) and different metallic phthalocyanines (cobalt, iron and manganese). Based on these studies it was possible to obtain the best system for the construction of the sensor. The device was obtained by the chemical modification of a glassy carbon electrode (GCE) with multiwalled carbon nanotubes (MWCNTs) and cobalt phthalocyanine (CoPc). The materials were characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). Under conditions previously optimized for the proposed method, an analytical curve was constructed, presenting linearity in a range of 2.50-90.0 µmol L −1 (R = 0.990), with detection limit of 2.20 µmol L −1 and quantification of 2.50 µmol L −1 . The validation of the methodology for the determination of EE using GCE-MWCNTs-CoPc was performed, being accurate, precise, stable and sensitive. The recovery of ethinyl estradiol in the sample of pharmaceutical formulation was 103.93%, in the samples of river water ranged from 92.75% to 96.47%, and in the milk sample was from 88.00% to 96.20%. Thus, the proposed method presented a viable alternative for the determination of ethinyl estradiol in the quality control of pharmaceutical and food formulations as well as in environmental control.

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“…It is commonly known that the surfactants present in solutions during voltammetry measurements change the electrochemical processes occurring on the surface of the electrode, significantly reduce the surface tension of mercury, and could additionally be adsorbed at the electrode surface by their hydrophobic tails and form a hydrophobic layer at the surface of the electrode [60].…”

Section: Decomposition Of Sds and Triton Tm X-114mentioning

confidence: 99%

Application of Hierarchical Nanostructured WO3 and Fe2O3 Composites for Photodegradation of Surfactants in Water Samples

et al. 2019

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This study describes the utilization of hierarchical photoactive surface films for the decomposition of surfactants in water samples (with different pH). Photoactive films, containing tungsten (VI) oxide and iron (III) oxide (hematite), were deposited in a systematic and controlled manner using a layer-by-layer method. Physicochemical properties of the photoactive materials were developed and characterized using XRD analysis, Raman spectroscopy, water contact angle, voltammetry, and microscopic (SEM) techniques. The resulting multilayer films showed attractive performances in the photodegradation of the anionic surfactant sodium dodecyl sulfate (SDS) and the nonionic surfactant (1,1,3,3-tetramethylbutyl)phenyl-polyethylene glycol (Triton™ X-144) under solar light irradiation. The efficiency of the surfactants’ photodegradation was evaluated with a “test” based on a method, which is extremely sensitive to surfactants’ interference, with trace analysis of Pb using anodic stripping voltammetry on mercury electrodes (recovery study). The usefulness of hierarchical photoactive systems in the photodegradation of both surfactants is demonstrated in the presence and absence of the applied bias voltage. The maximum decomposition times were 2–3 h and 30 min, respectively. Furthermore, a properly designed layer system may be proposed, matching the pH of the water sample (depending on the treatment on the sampling side).

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Voltammetric determination of estrone based on the enhancement effect of surfactant and a MWNT film electrode

Cited by 19 publications

References 28 publications

Total Determination of Estrogenic Phenolic Compounds in River Water Using a Sensor Based on Reduced Graphene Oxide and Molecularly Imprinted Polymer

Total Determination of Estrogenic Phenolic Compounds in River Water Using a Sensor Based on Reduced Graphene Oxide and Molecularly Imprinted Polymer

Development of Electrochemical Sensor Based on Carbonaceal and Metal Phthalocyanines Materials for Determination of Ethinyl Estradiol

Application of Hierarchical Nanostructured WO3 and Fe2O3 Composites for Photodegradation of Surfactants in Water Samples

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