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Amitrole

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Tebello Nyokong – One of the best experts on this subject based on the ideXlab platform.

  • Electrocatalytic oxidation of Amitrole and diuron on iron(II) tetraaminophthalocyanine-single walled carbon nanotube dendrimer
    Electrochimica Acta, 2010
    Co-Authors: Tawanda Mugadza, Tebello Nyokong
    Abstract:

    Abstract FeTAPc-single walled carbon nanotube (SWCNT) dendrimers are employed as glassy carbon electrode modifiers for the electrocatalytic oxidations of Amitrole and diuron. The catalytic rate constants were 4.55 × 10 3  M −1  s −1 and 1.79 × 10 4  M −1  s −1 for Amitrole and diuron, respectively using chronoamperometric studies. The diffusion constants were found to be 1.52 × 10 −4  cm 2  s −1 and 1.91 × 10 −4  cm 2  s −1 for diuron and Amitrole, respectively. The linear concentration range for both were from 5.0 × 10 −5 to 1.0 × 10 −4  M and sensitivities of 0.6603 μA/μM and 0.6641 μA/μM for Amitrole and diuron, with corresponding limits of detection of 2.15 × 10 −7 and 2.6 × 10 −7  M using the 3 δ notation, respectively.

  • Electrocatalytic Detection of Amitrole on the Multi-Walled Carbon Nanotube – Iron (II) tetra-aminophthalocyanine Platform
    Sensors (Basel Switzerland), 2008
    Co-Authors: Msimelelo P. Siswana, Kenneth I. Ozoemena, Tebello Nyokong
    Abstract:

    It is shown that iron(II) tetra-aminophthalocyanine complex electropolymerized onto a multi-walled carbon nanotube-modified basal plane pyrolytic graphite electrode greatly enhanced the electrocatalytic detetion of Amitrole (a toxic herbicide), resulting in a very low detection limit (0.5 nM) and excellent sensitivity of 8.80±0.44 μA/nM, compared to any known work reported so far. The electrocatalytic detection of Amitrole at this electrode occurred at less positive potential (~0.3 V vs Ag|ACl) and also revealed a typical coupled chemical reaction. The mechanism for this response is proposed. The electrode gave satisfactory selectivity to Amitrole in the presence of other potential interfering pesticides in aqueous solutions.

  • electrocatalytic detection of Amitrole on the multi walled carbon nanotube iron ii tetra aminophthalocyanine platform
    Sensors, 2008
    Co-Authors: Msimelelo Siswana, Kenneth I. Ozoemena, Tebello Nyokong
    Abstract:

    It is shown that iron(II) tetra-aminophthalocyanine complex electropolymerized onto a multi-walled carbon nanotube-modified basal plane pyrolytic graphite electrode greatly enhanced the electrocatalytic detetion of Amitrole (a toxic herbicide), resulting in a very low detection limit (0.5 nM) and excellent sensitivity of 8.80±0.44 μA/nM, compared to any known work reported so far. The electrocatalytic detection of Amitrole at this electrode occurred at less positive potential (~0.3 V vs Ag|ACl) and also revealed a typical coupled chemical reaction. The mechanism for this response is proposed. The electrode gave satisfactory selectivity to Amitrole in the presence of other potential interfering pesticides in aqueous solutions.

Manuel Chicharro – One of the best experts on this subject based on the ideXlab platform.

  • adsorptive stripping voltammetric determination of Amitrole at a multi wall carbon nanotubes paste electdrode
    Electroanalysis, 2005
    Co-Authors: Manuel Chicharro, Esperanza Bermejo, Mónica Moreno, Alberto Sanchez, A. Zapardiel, Gustavo A. Rivas
    Abstract:

    This work reports the excellent electrocatalytic activity of carbon nanotubes paste electrodes (CNTPE) prepared by dispersion of multi-wall carbon nanotubes (MWNT) within mineral oil toward the oxidation of 3-amino-1H-1,2,4triazole (Amitrole). The quantification is performed by adsorptive stripping voltammetry (AdSV). The influence of the paste composition and surface pretreatments as well as the Amitrole accumulation conditions on the adsorption and further electrooxidation of this herbicide is described. After potentiodynamic pretreatment in 0.050 M phosphate buffer pH 7.4 the Amitrole oxidation signal shifts 250 mV toward more negative potential and the sensitivity increases 29 fold, demonstrating that pretreated CNTPEs are extremely useful for a highly sensitive determination of Amitrole down to the sub-mM levels. The oxidation peak current is proportional to the Amitrole concentration over the range from 0.8 to 7.0 mM (5 min accumulation), with a detection limit of 0.6 mM (48 mgL � 1 ) and a precision of 4.3%, n ¼ 20. The proposed method was used for the determination of Amitrole in spiked river water (Alberche River (Madrid, Spain)) and tap water samples (Madrid, Spain) at levels higher than 0.6 mM.

  • Adsorptive Stripping Voltammetric Determination of Amitrole at a Multi‐Wall Carbon Nanotubes Paste Electdrode
    Electroanalysis, 2005
    Co-Authors: Manuel Chicharro, Esperanza Bermejo, Mónica Moreno, Alberto Sanchez, A. Zapardiel, Gustavo A. Rivas
    Abstract:

    This work reports the excellent electrocatalytic activity of carbon nanotubes paste electrodes (CNTPE) prepared by dispersion of multi-wall carbon nanotubes (MWNT) within mineral oil toward the oxidation of 3-amino-1H-1,2,4triazole (Amitrole). The quantification is performed by adsorptive stripping voltammetry (AdSV). The influence of the paste composition and surface pretreatments as well as the Amitrole accumulation conditions on the adsorption and further electrooxidation of this herbicide is described. After potentiodynamic pretreatment in 0.050 M phosphate buffer pH 7.4 the Amitrole oxidation signal shifts 250 mV toward more negative potential and the sensitivity increases 29 fold, demonstrating that pretreated CNTPEs are extremely useful for a highly sensitive determination of Amitrole down to the sub-mM levels. The oxidation peak current is proportional to the Amitrole concentration over the range from 0.8 to 7.0 mM (5 min accumulation), with a detection limit of 0.6 mM (48 mgL � 1 ) and a precision of 4.3%, n ¼ 20. The proposed method was used for the determination of Amitrole in spiked river water (Alberche River (Madrid, Spain)) and tap water samples (Madrid, Spain) at levels higher than 0.6 mM.

  • Determination of 3-amino-1,2,4-triazole (Amitrole) in environmental waters by capillary electrophoresis.
    Talanta, 2003
    Co-Authors: Manuel Chicharro, Esperanza Bermejo, Antonio Zapardiel, Mónica Moreno
    Abstract:

    Abstract 3-Amino-1,2,4-triazole (Amitrole) is a widely used pesticide, with many difficulties to be analyzed at the regulatory level in drinking water, because its high solubility in water. This paper describes a simple and fast method for the simultaneous determination of Amitrole and atrazin-2-hydroxy, principal degradation product of s -triazines, by capillary zone electrophoresis. Separation and determination of these herbicides in water samples was performed in 0.02 mol l −1 phosphate buffer at pH 3.2. The method allows determination of the Amitrole and atrazin-2-hydroxy in water samples in concentration lower than 100 μg l −1 . The detection limits using a previous preconcentration step of Amitrole in Alberche River (Comunidad Autonoma de Madrid, Spain) and drinking water spiked samples was of 4 μg l −1 .

Mónica Moreno – One of the best experts on this subject based on the ideXlab platform.

  • adsorptive stripping voltammetric determination of Amitrole at a multi wall carbon nanotubes paste electdrode
    Electroanalysis, 2005
    Co-Authors: Manuel Chicharro, Esperanza Bermejo, Mónica Moreno, Alberto Sanchez, A. Zapardiel, Gustavo A. Rivas
    Abstract:

    This work reports the excellent electrocatalytic activity of carbon nanotubes paste electrodes (CNTPE) prepared by dispersion of multi-wall carbon nanotubes (MWNT) within mineral oil toward the oxidation of 3-amino-1H-1,2,4triazole (Amitrole). The quantification is performed by adsorptive stripping voltammetry (AdSV). The influence of the paste composition and surface pretreatments as well as the Amitrole accumulation conditions on the adsorption and further electrooxidation of this herbicide is described. After potentiodynamic pretreatment in 0.050 M phosphate buffer pH 7.4 the Amitrole oxidation signal shifts 250 mV toward more negative potential and the sensitivity increases 29 fold, demonstrating that pretreated CNTPEs are extremely useful for a highly sensitive determination of Amitrole down to the sub-mM levels. The oxidation peak current is proportional to the Amitrole concentration over the range from 0.8 to 7.0 mM (5 min accumulation), with a detection limit of 0.6 mM (48 mgL � 1 ) and a precision of 4.3%, n ¼ 20. The proposed method was used for the determination of Amitrole in spiked river water (Alberche River (Madrid, Spain)) and tap water samples (Madrid, Spain) at levels higher than 0.6 mM.

  • Adsorptive Stripping Voltammetric Determination of Amitrole at a Multi‐Wall Carbon Nanotubes Paste Electdrode
    Electroanalysis, 2005
    Co-Authors: Manuel Chicharro, Esperanza Bermejo, Mónica Moreno, Alberto Sanchez, A. Zapardiel, Gustavo A. Rivas
    Abstract:

    This work reports the excellent electrocatalytic activity of carbon nanotubes paste electrodes (CNTPE) prepared by dispersion of multi-wall carbon nanotubes (MWNT) within mineral oil toward the oxidation of 3-amino-1H-1,2,4triazole (Amitrole). The quantification is performed by adsorptive stripping voltammetry (AdSV). The influence of the paste composition and surface pretreatments as well as the Amitrole accumulation conditions on the adsorption and further electrooxidation of this herbicide is described. After potentiodynamic pretreatment in 0.050 M phosphate buffer pH 7.4 the Amitrole oxidation signal shifts 250 mV toward more negative potential and the sensitivity increases 29 fold, demonstrating that pretreated CNTPEs are extremely useful for a highly sensitive determination of Amitrole down to the sub-mM levels. The oxidation peak current is proportional to the Amitrole concentration over the range from 0.8 to 7.0 mM (5 min accumulation), with a detection limit of 0.6 mM (48 mgL � 1 ) and a precision of 4.3%, n ¼ 20. The proposed method was used for the determination of Amitrole in spiked river water (Alberche River (Madrid, Spain)) and tap water samples (Madrid, Spain) at levels higher than 0.6 mM.

  • Determination of 3-amino-1,2,4-triazole (Amitrole) in environmental waters by capillary electrophoresis.
    Talanta, 2003
    Co-Authors: Manuel Chicharro, Esperanza Bermejo, Antonio Zapardiel, Mónica Moreno
    Abstract:

    Abstract 3-Amino-1,2,4-triazole (Amitrole) is a widely used pesticide, with many difficulties to be analyzed at the regulatory level in drinking water, because its high solubility in water. This paper describes a simple and fast method for the simultaneous determination of Amitrole and atrazin-2-hydroxy, principal degradation product of s -triazines, by capillary zone electrophoresis. Separation and determination of these herbicides in water samples was performed in 0.02 mol l −1 phosphate buffer at pH 3.2. The method allows determination of the Amitrole and atrazin-2-hydroxy in water samples in concentration lower than 100 μg l −1 . The detection limits using a previous preconcentration step of Amitrole in Alberche River (Comunidad Autonoma de Madrid, Spain) and drinking water spiked samples was of 4 μg l −1 .