Polarographic behavior and determination of some <scp>S</scp>‐triazine herbicides

Ignjatović, Lj. M.; Marković, Dragan; Veselinović, Dragan; Bešić, Borislav R.

doi:10.1002/elan.1140050525

Cited by 41 publications

(37 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The selectivity of the optimized procedure was tested in the presence of the most common herbicide from the striazine family, atrazine. In the literature, it is well established that traditional mercury electrodes are not adequate for selectively determining pesticides from this class [4][5][6][7][8][9][10][11][12]. When the mixture contains more than one triazine compound, only one polarogaphic cathodic peak is detected because the peak potential values are very close together [4][5][6][7][8][9][10][11][12].…”

Section: Voltammetric Analytical Characteristics and Applicationmentioning

confidence: 99%

“…Surveys of the distributions of triazine herbicides, such as ametryn (2-methylthio-4-ethylamino-6-isopropylamino-1,3,5-triazine) and atra-zine (2-chloro-4-ethylamino-6-isopropylamino-1,3, 5-triazine), in the environment are generally performed using gas chromatography, high performance liquid chromatography (HPLC) and thin-layer chromatogra-phy [3]. Among the electrochemical methods, polarog-raphy is the most commonly-used technique [4][5][6][7][8][9][10][11][12]. In addition to chromatographic methods, adsorptive stripping voltammetry (AdsV), the most sensitive electroanalytical technique currently available [13], has been proven to be suitable for trace analysis of pesticides [14].…”

Section: Introductionmentioning

confidence: 99%

“…Only mercury electrodes have been tested as working electrodes in AdsV, where they were used in the cathodic AdsV determination of s-triazine [4][5][6][10][11][12]. No study concerning anodic AdsV detection can be found in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…No study concerning anodic AdsV detection can be found in the literature. In the procedures reported, the substances to be analysed were removed from water by solid phase extraction [5,8,10,12], and from wastewaters [6] and from soils by liquid extraction [12].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Determination of ametryn in soils via microwave-assisted solvent extraction coupled to anodic stripping voltammetry with a gold ultramicroelectrode

et al. 2005

View full text Add to dashboard Cite

An extraction-anodic adsorptive stripping vol-tammetric procedure using microwave-assisted solvent extraction and a gold ultramicroelectrode was developed for determining the pesticide ametryn in soil samples. The method is based on the use of acetonitrile as extraction solvent and on controlled adsorptive accumulation of the herbicide at the potential of 0.50 V (vs. Ag/AgCl) in the presence of Britton-Robinson buffer (pH 3.3). Soil sample extracts were analysed directly after drying and redis-solution with the supporting electrolyte but without other pre-treatment. The limit of detection obtained for a 10 s collection time was 0.021 lg g -1. Recovery experi-ments for the global procedure, at the 0.500 lg g -1 level, gave satisfactory mean and standard deviation results which were comparable to those obtained by HPLC with UV detection.

show abstract

Section: Voltammetric Analytical Characteristics and Applicationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Determination of ametryn in soils via microwave-assisted solvent extraction coupled to anodic stripping voltammetry with a gold ultramicroelectrode

et al. 2005

View full text Add to dashboard Cite

show abstract

“…O efeito da presença de outras s-triazinas no pico de redução da simazina também foi estudado. Ignjatovic e colaboradores 12 mostraram a determinação na forma de misturas de algumas striazinas (atrazina, ametrina e simazina) por DPP em amostras de águas contaminadas com resíduos industriais e obtiveram concentrações entre 0,090 a 344,4 mg L -1 .…”

Section: Introductionunclassified

Metodologias eletroanalíticas para a determinação de herbicidas triazínicos por voltametria de onda quadrada e técnicas de deconvolução

Garbellini¹,

Pedrosa²,

Salazar‐Banda³

et al. 2007

Quím. Nova

View full text Add to dashboard Cite

Recebido em 27/10/06; aceito em 2/3/07; publicado na web em 25/10/07 ELECTROANALYTICAL METHODOLOGIES FOR THE DETERMINATION OF TRIAZINE HERBICIDES BY SQUARE WAVE VOLTAMMETRY AND DECONVOLUTION TECHNIQUES. This work describes the development of electroanalytical methodologies for the determination of atrazine, ametrine and simazine by square wave voltammetry on a mercury electrode. For pure atrazine and pure ametrine, the detection limits (DL) were 3.7 and 4.3 µg L -1 , respectively, while they increased to 4.8 and 6.5 µg L -1 in the presence of 3.0 x 10 -6 mol L -1 of the other component (a mathematical deconvolution program was used in the mixture cases). The voltammetric response for simazine could not be separated from that of atrazine and measurements were carried out only in pure simazine solutions (DL: 7.5 µg L -1 ).Keywords: triazines; square wave voltammetry; mercury electrode. INTRODUÇÃOO aumento da produção de grãos em nosso país nos últimos anos não deve ser analisado apenas pelo lado do favorecimento econômico que este produz. Temos que lembrar, também, que para competir nos mercados internacionais precisamos de uma alta eficiência. Porém, vale ressaltar que obter melhor produtividade, hoje em dia, implica no maior uso de defensivos agrícolas para prevenção e controle de pragas. Nesse sentido e segundo a Organização Mundial da Saúde, o Brasil é um dos países que mais utiliza pesticidas, ocupando atualmente um dos primeiros lugares no mercado mundial, com destaque para o estado de São Paulo que é responsável pelo uso de 25% deste total comercializado.As triazinas são muito utilizadas como herbicidas no controle pré e pós-emergente de ervas daninhas nas mais variadas culturas, tais como, milho, cana-de-açúcar, sorgo, abacaxi, banana, café, uvas, entre outras 1 . As s-triazinas possuem um anel heterocíclico de seis membros onde os átomos de carbono e nitrogênio são simetricamente localizados e os substituintes das posições 2, 4 e 6, constituem-se no diferencial entre as várias formulações disponíveis comercialmente 2 . Derivados das s-triazinas e seus produtos de degradação são muito tóxicos, altamente resistentes e persistem muitos anos no solo, nas águas, plantas e animais. Conseqüentemente, as determinações das triazinas são muito importantes para o controle ambiental 3 . Dentre as mais importantes, temos a atrazina, a ametrina e a simazina, cujas estruturas são apresentadas na Figura 1.Os níveis de triazinas no ambiente são normalmente quantificados usando uma ou mais combinações de técnicas cromatográficas 4,5 . Apesar dos métodos cromatográficos serem precisos, sensíveis e seletivos, são trabalhosos e relativamente caros quando comparados com outras técnicas de análise. Isto tem despertado o interesse para a detecção e quantificação de herbicidas por técni-cas eletroanalíticas, pois, além de simples e de baixo custo, elas oferecem a possibilidade de se determinar a concentração do herbicida diretamente na amostra, sem pré-tratamentos ou separações químicas 6 . Entre as mais utilizadas atualmente, de...

show abstract

Electrochemical Reduction of Prometryne and the Other 2-Methylthio-4,6-dialkylamino-s-triazine Herbicides at Mercury Electrodes

Skopalová¹,

Lemr

Kotouček

et al. 1998

Electroanalysis

View full text Add to dashboard Cite

The electrochemical behavior of the herbicide prometryne was studied in aqueous solutions by DC polarography, differential pulse and cyclic voltammetry and by constant potential coulometry. Only the protonated form of prometryne can be reduced at pH < 6.5. The electrode process includes two irreversible steps. The two-electron reduction of the C-S bond leads to its splitting and a release of methylthiol molecule. The triazine ring of the reduction product is immediately reduced under the uptake of two electrons. Both the intermediate and final products of constant potential electrolysis were identified using chromatographic techniques and mass spectrometric analysis. The reduction mechanism of other 2-methylthio-4,6-dialkylamino-s-triazines is identical.

show abstract

Polarographic behavior and determination of some S‐triazine herbicides

Cited by 41 publications

References 11 publications

Determination of ametryn in soils via microwave-assisted solvent extraction coupled to anodic stripping voltammetry with a gold ultramicroelectrode

Determination of ametryn in soils via microwave-assisted solvent extraction coupled to anodic stripping voltammetry with a gold ultramicroelectrode

Metodologias eletroanalíticas para a determinação de herbicidas triazínicos por voltametria de onda quadrada e técnicas de deconvolução

Electrochemical Reduction of Prometryne and the Other 2-Methylthio-4,6-dialkylamino-s-triazine Herbicides at Mercury Electrodes

Contact Info

Product

Resources

About