Differential Pulse Polarographic Determination of Benfluralin and Trifluralin in Formulations Soils and Grains

Sreedhar, N. Y.; Samatha, Kethamreddy; Reddy, P. Sreenivasula; Reddy, S. Lakshmi

doi:10.1080/03067319808035896

Cited by 17 publications

(10 citation statements)

References 4 publications

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“…A detection limit of 7.45 × 10 -8 mol L -1 TRF was estimated (determined as corresponding to three times of S. D. of the zero-dose response), that allows to quantify within the acceptable limits allowed, for example, in drinking water. This value is much smaller than that observed on the bare glassy carbon electrode (4.58 × 10 -6 mol L -1 ), although higher than the ones obtained using DPP and mercury, 28,29 however the present method is environmentally friend and very easy and cheap to achieve. …”

Section: Electrochemical Resultscontrasting

confidence: 60%

“…28 This individual reduction peaks are due to the well-known 4e -/4H + reduction of the nitro groups to produce the corresponding hydroxylamine derivative. The reduction of the two nitro groups to hydroxylamine functions was confirmed by coulometry with consumption of 7.75 mol electron mol -1 .…”

Section: Electrochemical Resultsmentioning

confidence: 99%

“…5.3, related to dissociation of the ammonium group of TRF. 28 It should be emphasized that at pH 6.9, chosen for additional experiments, TRF appears in its neutral form.…”

Section: Electrochemical Resultsmentioning

confidence: 99%

“…19 Several methods, [20][21][22][23][24][25][26][27][28][29] including electroanalytical ones, 28,29 are used to determine this class of pesticides in solution or in real samples. Trifluralin and compounds of the same series (dinitroanilines) were earlier quantified in food, using biosensors.…”

Section: Introductionmentioning

confidence: 99%

“…Quantitative measurements were successful in the concentration range of 1.25 × 10 -5 to 2.85 × 10 -9 mol L -1 , the lower concentration representing the detection limit by differential pulse polarography. 28 However, despite very good detection limits obtained there are some environmental problems related to the use of mercury and also related to the direct electrochemical detection of related nitrocompounds, due to adsorption on the most conventional electrodes. In this context, chemically modified electrodes (CMEs) have been widely used as sensitive and selective analytical methods for detection and quantification of several classes of compounds.…”

mentioning

confidence: 99%

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Adsorption studies of trifluralin on chitosan and its voltammetric determination on a modified chitosan glassy carbon electrode

Melo¹,

Valentim²,

Goulart³

et al. 2008

J. Braz. Chem. Soc.

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Os estudos sobre adsorção do herbicida trifluralina (TRF) em quitosana foram realizados em batelada, usando temperaturas entre 298 e 313 K. Os resultados de adsorção ajustaram-se perfeitamente ao modelo de adsorção de Langmuir. O valor de entalpia obtido −10,2 ± 0,8 kJ mol -1 confirma que a interação TRF-quitosana é exotérmica e que o processo de adsorção é relativo à interação eletrostática entre o grupo amônio da quitosana e o dipolo negativo dos grupos substituintes de TRF, sendo dependente da força iônica. Estudos voltamétricos mostraram que TRF apresentou dois picos de redução em eletrodo de CV, ambos de natureza difusional e irreversível, referentes à redução dos grupos nitroaromáticos. A corrente do primeiro pico de redução intensificou-se no eletrodo de carbono vítreo modificado com quitosana, em comparação com o eletrodo não modificado. Isto foi atribuído à adsorção/acumulação de TRF em quitosana. A corrente de redução em voltametria de pulso diferencial foi proporcional à concentração de TRF na faixa de 2,49 × 10 −7 a 5,79 × 10 −6 mol L -1 , com limite de detecção de 7,45 × 10 -8 mol L -1 .The studies about adsorption of the herbicide trifluralin (TRF), on chitosan, were carried out by batch methods using temperatures from 298 up to 313 K. The adsorption results were well fitted to Langmuir adsorption model. The obtained enthalpic value of −10.2 ± 0.8 kJ mol -1 confirms that the TRF-chitosan interaction is exothermic and that the adsorption process is relative to electrostatic interaction between the ammonium group of chitosan and the negative dipole of the substituent groups of TRF, being dependent on ionic strength. Voltammetric studies showed that TRF exhibited two irreversible, diffusional reduction waves related to the reduction of the nitroaromatic groups. The current of the first reduction peak intensified on the chitosan-modified glassy carbon electrode in comparison with the unmodified one. This was attributed to the adsorption/accumulation of TRF on chitosan. The reduction current, using Differential Pulse Voltammetry, was proportional to the concentration of TRF in the range of 2.49 ×10 −7 to 5.79 ×10 −6 mol L -1 , with a detection limit of 7.45 × 10 -8 mol L -1 . Keywords: adsorption, trifluralin, electroanalytical, chitosan IntroductionWater pollution by pesticides from routine agricultural practices is a common and growing problem in the major agricultural areas of the world. Herbicide contamination of water systems has been of major concern in recent years. Trifluralin [2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl) aniline, CAS 1582-09-8] is a dinitroaniline pre-emergence herbicide used for the control of broadleaf weeds in a wide variety of crops including cotton, brassica, soybeans and ornamentals, among others. 1 TRF is a relatively immobile herbicide in soils so there is little hazard for groundwater contamination, however it has a tendency to volatilize, 2 with vapor pressure 1.5 × 10 -2 Pa 3 and Henry Constant H = 16.8 Pa m 3 mol -1 at 25 o C, hence it can relatively easily enter ...

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Section: Electrochemical Resultscontrasting

confidence: 60%

Section: Electrochemical Resultsmentioning

confidence: 99%

“…5.3, related to dissociation of the ammonium group of TRF. 28 It should be emphasized that at pH 6.9, chosen for additional experiments, TRF appears in its neutral form.…”

Section: Electrochemical Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Adsorption studies of trifluralin on chitosan and its voltammetric determination on a modified chitosan glassy carbon electrode

Melo¹,

Valentim²,

Goulart³

et al. 2008

J. Braz. Chem. Soc.

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Sensitive Electrochemical Determination of Trifluralin at a Disposable Pencil Graphite Electrode

2021

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A sensitive differential pulse (DP) voltammetric method has been proposed for the determination of trifluralin (TFA) based on both its reduction and oxidation at a disposable pencil graphite electrode (PGE). DP voltammograms recorded under optimized conditions show that oxidation and reduction peak currents increased linearly in the range from 1.0 to 75.0 μM and from 0.50 to 100.0 μM TFA, respectively. LOD and sensitivity values have been determined as 0.39 μM and 11170 μA mM−1 cm−2 for oxidation and as 0.20 μM and 22167 μA mM−1 cm−2 for reduction. The acceptable recovery values (95.2–104.8 %) were obtained from real water samples.

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A stretchable glove sensor toward rapid monitoring of trifluralin: A new platform for the on‐site recognition of herbicides based on wearable flexible sensor technology using lab‐on‐glove

Mahmoudpour

Saadati

Hasanzadeh

et al. 2021

J of Molecular Recognition

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In this study, a flexible glove-based electrochemical sensor as a wearable point-ofuse screening tool has been fabricated for defense and food security applications. To design the wearable glove-based sensor, we drew conductive patterns on the fingers of a rubber glove via gold@silver-modified graphene quantum dots (Au@Ag coreshell/graphene quantum dots [GQDs]) nano-ink with optimal thickness. Then, this platform is combined with a portable electrochemical analyzer for on-site detection of trifluralin pesticide in the range of 10 nM to 1 mM with the low limit of quantification (LLOQ) of 10 nM. The high efficiency and distinction of the trifluralin at specified concentrations in real leaf and apple samples were performed by simply touching with the glove and in spikes solution by immersing of fingertips. With their high sensitivity, selectivity, rapid, and easy operation pesticide analysis, these gloveembedded sensors can also be engaged in on-site monitor of other chemical threats and can be expanded to water and environmental samples.

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Differential Pulse Polarographic Determination of Benfluralin and Trifluralin in Formulations Soils and Grains

Cited by 17 publications

References 4 publications

Adsorption studies of trifluralin on chitosan and its voltammetric determination on a modified chitosan glassy carbon electrode

Adsorption studies of trifluralin on chitosan and its voltammetric determination on a modified chitosan glassy carbon electrode

Sensitive Electrochemical Determination of Trifluralin at a Disposable Pencil Graphite Electrode

A stretchable glove sensor toward rapid monitoring of trifluralin: A new platform for the on‐site recognition of herbicides based on wearable flexible sensor technology using lab‐on‐glove

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