Electrochemical behavior and voltammetric determination of the herbicide metribuzin at mercury electrodes

Skopalová, Jana; Lemr, Karel; Kotouček, Milan; Čáp, Lubomír; Barták, Petr

doi:10.1007/s002160100845

Cited by 26 publications

(20 citation statements)

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“…The metamitron and metribuzin signals obtained with the BiFE are sharper and 50 and 125 mV-positively shifted, respectively, when compared to those obtained using the GCE, indicating that the electron transfer rate is favored in BiFE; moreover, metribuzin presents a second wave around À 735 mV which is not observed in GCE. This second wave was also observed at a dropping-mercury electrode [19] and it is attributed to the reduction of the C À SCH 3 bond. Atrazine and maleic hydrazide did not present reduction signal at bare GCE while both herbicides present a clearly defined cathodic peak at À 750 and À 760 mV respectively at BiFE, allowing their detection and determination using this electrode.…”

Section: Voltammetric Application Of Bifementioning

confidence: 62%

“…Among them, triazinic herbicides could undergo electrochemical reduction, studied mainly at mercury electrodes in acidic medium [18,19]. This work describes a revised procedure for the preparation of bismuth film electrode (BiFE), adapted to improve its performance in acid media, with the aim to apply it for the analysis of herbicides under these conditions, concept not reported to date.…”

Section: Introductionmentioning

confidence: 99%

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Cathodic Electrochemical Determination of Herbicides in Acid Media Using a Bismuth Film Electrode

et al. 2009

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A revised procedure for the preparation of bismuth film electrodes (BiFEs), adapted to improve its performance in acid media, is presented and applied for the analysis of herbicides under these conditions. Common carbon-based substrates have been studied for the preparation of ex situ BiFE as well as the influence of relevant parameters upon the bismuth film formation (plating solution, deposition potential and deposition time). A plating solution consisting of 0.60 mM Bi(NO 3 ) 3 in 0.10 M H 2 SO 4 and a careful selection of the plating potential (equal to the cathodic peak potential in this solution) applied during 360 s yields to a suitable BiFE in terms of stability and electroanalytical performance. The applicability of the BiFE was investigated for the analysis of the herbicides metamitron, metribuzin, maleic hydrazide and atrazine in nondeaerated solutions by square-wave voltammetry (SWV). In all cases the enhanced electrochemical performance of the BiFE over bare glassy carbon electrode (GCE) is evident. Herbicides signals at BiFE have improved sensitivity and a positive potential shift is observed when compared to bare GCE. The herbicide metribuzin (4-amino-6-tert-4,5-dihydro-3-methyl-thio-1,2,4-triazin-5-one) was determinated in nondeaerated solutions by square-wave voltammetry (SWV) using BiFE. Under optimal conditions, the dynamic linear range of concentrations is comprised between 10 and 200 mM and the detection limit is 6 mM.

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Section: Voltammetric Application Of Bifementioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Cathodic Electrochemical Determination of Herbicides in Acid Media Using a Bismuth Film Electrode

et al. 2009

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“…Some herbicides containing triazine rings were already quantified in soils, [25][26][27] plants [28][29][30] and water [31][32][33][34][35][36] by voltammetry using, in most of the cases, mercury as working electrode. The electrode reaction of 1,3,5-triazine compounds depends primarily on the species located at the 2-position on the triazine ring (which is a thiomethyl group for some triazines), so that other substituents linked to the ring in different triazines are too far from the electroactive centre (2-position) and no pronounced effect on the peak potentials was expected.…”

Section: Adsorption Of Triazine On the Mercury Electrodementioning

confidence: 99%

“…Although there is a number of methods employed to assay pesticides using different detectors as fluorimetric, [11][12][13][14][15][16][17] photometric [18][19][20] and electrochemical, [21][22][23] some problems still arise associated with the complexity of the matrices, particularly in the case of HS solutions where the ionic strength is so high that the common methods frequently fail. To overcome this difficulty, large dilution factors are often used but with prejudice to the sensitivity of the methods.…”

Section: Introductionmentioning

confidence: 99%

Determination of triazines in hemodialysis saline solutions by adsorptive stripping voltammetry after extraction in acetonitrile

Nascimento¹,

Bohrer²,

Carvalho³

et al. 2003

J. Braz. Chem. Soc.

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A determinação de herbicidas 2-metiltio-4,6-dialquilamino-1,3,5-triazina (triazinas) em soluções salinas utilizadas em hemodiálise foi investigada por voltametria. Os herbicidas foram detectados com grande sensibilidade nas soluções salinas, após extração em fase de acetonitrila (ACN), utilizando o eletrodo de mercúrio de gota pendente. O efeito de salting out originado pelo meio salino existente nas soluções viabilizou as extrações. A relação de volumes entre as fases salina e de ACN foi investigada para alcançar a melhor sensibilidade na detecção das triazinas. A especiação entre as triazinas investigadas (ametrina, desmetrina, prometrina e terbutrina) não foi possível e recuperações entre 88 e 107% foram calculadas em amostras fortificadas com os analitos. Utilizando esta metodologia, limites de detecção de 0,03 µmol L -1 foram calculados para as triazinas nas amostras salinas.A method for the voltammetric determination of 2-methylthio-4,6-dialkylamino-1,3,5-triazine (triazines) herbicides in hemodialysis (HD) saline solutions was developed. The herbicides were detected in the saline solutions at the hanging mercury drop electrode (HMDE) with high sensitivities only after extraction of the analytes in acetonitrile (ACN). The salting out effect originated by the saline environment existing in the solutions enabled the extractions. The volume ratio between the saline and ACN phases was investigated in order to find the best sensitivity to detect the triazines. The speciation amongst them (ametryn, desmetryn, prometryn and terbutryn) was not possible. Recoveries between 88 and 107% were calculated in spiked samples, and detection limits of 0.03 µmol L -1 were calculated for the triazines in the saline samples using this methodology. Keywords: herbicides, triazines, hemodialysis, voltammetry IntroductionThe growing interest in the use of pesticides in agricultural production and their negative environmental impact has led to a number of studies for the development of different analytical methods. Besides the frequently used chromatographic measurements, voltammetry, mainly with differential pulse modes 1-9 should be taken into consideration as a fast, easy and inexpensive alternative. Additionally, the sensitivity of the electrochemical methods, their applicability over an unusually wide concentration range, is highly satisfactory for meeting requirements of toxicological, ecotoxicological and environmental regulation enforcement. 10 Hemodialysis (HD) solutions are prepared by mixing pure water and a high-salt (HS) content solution (about 7.0 mol L -1 ) to compose the final HD solution that has a salt concentration of about 0.2 mol L -1 . It is used to maintain the blood ionic equilibrium of the patients during the hemodialysis sessions. The presence of contaminants in the water or in HS solutions must be detected before a hemodialysis session as the HD solution remains very close to the blood of the patients separated only by the dialysis membranes. To aggravate the problem, the dialysis membranes can dialysate ...

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“…In the previous investigations, some herbicides containing triazine ring were studied in soils [25][26][27], plants [28][29][30], and water [31][32][33][34][35][36] by voltammetry using, mercury as working electrode in most cases. The electrode reaction of 1,3,5-triazine compounds depends primarily on the species located at the 2-position of the triazine ring, which is a thiomethyl group for some triazines.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical behavior of some triazine derivatives at glassy carbon electrode in non-aqueous media

Farzinnejad

Beigi²,

Fotouhi

et al. 2005

Journal of Electroanalytical Chemistry

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Electrochemical behavior and voltammetric determination of the herbicide metribuzin at mercury electrodes

Cited by 26 publications

References 0 publications

Cathodic Electrochemical Determination of Herbicides in Acid Media Using a Bismuth Film Electrode

Cathodic Electrochemical Determination of Herbicides in Acid Media Using a Bismuth Film Electrode

Determination of triazines in hemodialysis saline solutions by adsorptive stripping voltammetry after extraction in acetonitrile

Electrochemical behavior of some triazine derivatives at glassy carbon electrode in non-aqueous media

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