Direct Electrochemical Determination of Glyphosate at Copper Phthalocyanine/Multiwalled Carbon Nanotube Film Electrodes

Moraes, Fernando C.; Mascaro, Lúcia H.; Machado, Sérgio Antônio Spínola; Brett, Christopher M.A.

doi:10.1002/elan.200900614

Cited by 78 publications

(35 citation statements)

References 31 publications

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“…In a comparison of the porous copper nanowires electrode with other electrochemical glyphosate detectors (Table 1), this electrode provided a lower LOD than was obtained by a Ni (1−x) Al x (OH) 2 NO 3x · nH 2 Olayered double-hydroxide-modified Pt electrode (1.0 mol L −1 ) (Khenifi et al, 2009), an electroaggregation of silver carbonate on a platinum electrode (40 mol L −1 ) (Méndez et al, 2007). It also provided a much lower LOD than reported in other works using copper with in similar principle a similar way (Moraes et al, 2010;Kodama et al, 2008;Coutinho et al, 2007c). In addition, with its large surface area the porous copper nanowires electrode provided a good operational stability which is the greatest challenge to detection based on this principle.…”

Section: 59-200 590supporting

confidence: 36%

One-step preparation of porous copper nanowires electrode for highly sensitive and stable amperometric detection of glyphosate

et al. 2015

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A simple and sensitive amperometric method for the detection of glyphosate based on a porous copper nanowire electrode is presented. The porous nanowires were fabricated simply by a one-step electrodeposition using hydrogen bubbles generated during the deposition to produce pores. These porous nanowires provided a 1.4 times larger surface area than a porous copper film. After the fabrication process the porous copper nanowires can be applied directly as a working electrode with the same custom-built flow cell. The detection was carried out by measuring the oxidation signal of copper; this increased with the concentration of glyphosate due to dissolution of the copper from the electrode. Under optimal conditions, the responses of the sensor were linear between 0.010-5.0 µmol L −1 , with a limit of detection of 10.0 nmol L −1 (S/N = 3). The large surface area of the electrode minimised the corrosion effect, as observed by the remarkably stable response (95 injections of 0.20 µmol L −1 of glyphosate were possible). When applied in order to detect glyphosate in fresh fruit and vegetable samples, the concentrations were found in the range of non-detectable to (0.104 ± 0.005) µmol L −1 . These results indicated that the fabrication process can be used to produce a new form of working electrode for glyphosate detection.

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Section: 59-200 590supporting

confidence: 36%

One-step preparation of porous copper nanowires electrode for highly sensitive and stable amperometric detection of glyphosate

et al. 2015

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“…However, the detection of GLYP was possible using copperbased electrodes by means of chromatography [24] and electrochemical methods [25,26]. Fig.…”

Section: Dependence On Scan Ratementioning

confidence: 99%

Is the poly (methylene blue)-modified glassy carbon electrode an adequate electrode for the simple detection of thiols and amino acid-based molecules?

Marinho

Cabral

Mazo

2012

Journal of Electroanalytical Chemistry

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a b s t r a c tThis paper describes the preparation, characterization, and use of poly (methylene blue) (PMB)-modified glassy carbon electrodes (GCE) (GCE-PMB) in the detection of the thiols L-cysteine (L-CySH) and N-acetyl cysteine (Acy), and the herbicide glyphosate (GLYP) in pH 5.3 aqueous solution. The polymer film prepared by electropolymerization showed different characteristics such as robustness, stability, and redox properties satisfactorily. The surface coverage concentration (C) of PMB was found to be 7.90 Â 10 À9 -mol cm À2 . Moreover, we observed strong adhesion of the polymer film to the electrode surface. The results using GCE-PMB as a sensor indicated that this modified electrode exhibited electrocatalytic activity toward the detection of thiols and glyphosate in 0.1 mol L À1 KCl (pH 5.3). Meanwhile, strong adsorption of the analytes on the GCE-PMB electrodes was also observed. Otherwise, using a low concentration (1 Â 10 À4 mol L À1 ) of L-cysteine and N-acetyl cysteine and 8.9 Â 10 -6 mol L À1 of glyphosate, separately, it was possible to observe a well-defined electrochemical response, thus providing an opportunity to further understand the applicability of PMB as a sensor for amino acid-based molecules.

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“…Glyphosate has been reported to be detected using bare and modified electrodes made of gold [28,[37][38][39][40][41][42][43][44], copper [45][46][47], carbon [48][49][50][51][52][53][54], mercury [55][56][57], and platinum [58,59]. Electrochemical methods, type of electrodes, analytical performance, measurement condition, and sample matrix for glyphosate determination are summarized in Table 1.…”

Section: Electrochemical Detection Of Glyphosatementioning

confidence: 99%

“…Similarly, a glassy carbon electrode modified with copper phthalocyanine/multi-walled carbon nanotube(GCE/MWCNT/CuPc) film has been used for the determination of glyphosate by electrochemical oxidation using DPV [48]. The authors reported that the strong interaction between glyphosate and copper ions to form a stable complex contributed the indirect detection of glyphosate at − 50.0 mV vs. SCE based on Cu(I)/Cu(II) couple.…”

Section: Electrochemical Detection Of Glyphosatementioning

confidence: 99%

Recent Development on the Electrochemical Detection of Selected Pesticides: A Focused Review

Noori¹,

Mortensen

Geto³

2020

Sensors

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Pesticides are heavily used in agriculture to protect crops from diseases, insects, and weeds. However, only a fraction of the used pesticides reaches the target and the rest slips through the soil, causing the contamination of ground-and surface water resources. Given the emerging interest in the on-site detection of analytes that can replace traditional chromatographic techniques, alternative methods for pesticide measuring have recently encountered remarkable attention. This review gives a focused overview of the literature related to the electrochemical detection of selected pesticides. Here, we focus on the electrochemical detection of three important pesticides; glyphosate, lindane and bentazone using a variety of electrochemical detection techniques, electrode materials, electrolyte media, and sample matrix. The review summarizes the different electrochemical studies and provides an overview of the analytical performances reported such as; the limits of detection and linearity range. This article highlights the advancements in pesticide detection of the selected pesticides using electrochemical methods and point towards the challenges and needed efforts to achieve electrochemical detection suitable for on-site applications.

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Direct Electrochemical Determination of Glyphosate at Copper Phthalocyanine/Multiwalled Carbon Nanotube Film Electrodes

Cited by 78 publications

References 31 publications

One-step preparation of porous copper nanowires electrode for highly sensitive and stable amperometric detection of glyphosate

One-step preparation of porous copper nanowires electrode for highly sensitive and stable amperometric detection of glyphosate

Is the poly (methylene blue)-modified glassy carbon electrode an adequate electrode for the simple detection of thiols and amino acid-based molecules?

Recent Development on the Electrochemical Detection of Selected Pesticides: A Focused Review

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