Amperometric Method for the Determination of Propanil in a Simulated Rice Field Environment

Priyantha, Namal; Navaratne, Ayanthi; Jayawickrama, D.A.; Weliwegamage, U. S. K.

doi:10.4038/jnsfsr.v32i3-4.2431

Cited by 3 publications

(4 citation statements)

References 7 publications

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“…They obtained a detection limit of 0.97 mM, very close to the 0.99 mM found here at the PANI-b-CD/fMWCNT film electrode; the analytical sensitivity of 0.0327 A M À 1 cannot be directly compared since the electrode area is not specified in [27], but is lower by a factor of around 4 than that here, if electrode areas are the same or similar.…”

Section: Analytical Applicationsupporting

confidence: 78%

“…The only electroanalytical determination of MCPA found in the literature tests MnO 2 -modified carbon paste electrodes and Mnmodified glassy carbon electrodes, of which the former are better [27]. They obtained a detection limit of 0.97 mM, very close to the 0.99 mM found here at the PANI-b-CD/fMWCNT film electrode; the analytical sensitivity of 0.0327 A M À 1 cannot be directly compared since the electrode area is not specified in [27], but is lower by a factor of around 4 than that here, if electrode areas are the same or similar.…”

Section: Analytical Applicationmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced host–guest electrochemical recognition of herbicide MCPA using a β-cyclodextrin carbon nanotube sensor

Rahemi¹,

Vandamme²,

Garrido

et al. 2012

Talanta

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a b s t r a c tAn electrochemical sensor for the determination of the chlorophenoxy herbicide MCPA has been developed, based on a combination of multi-walled carbon nanotubes with incorporated b-cyclodextrin and a polyaniline film modified glassy carbon electrode. The proposed molecular host-guest recognition based sensor has a high electrochemical sensitivity for the determination of MCPA. The electrochemical behaviour of MCPA at the chemically modified electrode was investigated in detail by cyclic voltammetry. The results indicate that the b-CD/MWCNT modified glassy carbon electrode exhibits efficient electrocatalytic oxidation of MCPA with high sensitivity, stability and lifetime. The analytical characteristics of this film were used for the quantitative determination of MCPA in natural waters. Cyclic voltammetry in phosphate buffer solution at pH 6.0, allowed the development of a method to determine MCPA, without any previous steps of extraction, clean-up, or derivatization, in the range of 10-100 mmol L À 1 , with a detection limit of 0.99 mmol L À 1 in water. The results were statistically compared with those obtained through an established high-performance liquid chromatography technique, no significant differences having been found between the two methods.

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Section: Analytical Applicationsupporting

confidence: 78%

Section: Analytical Applicationmentioning

confidence: 99%

Enhanced host–guest electrochemical recognition of herbicide MCPA using a β-cyclodextrin carbon nanotube sensor

Rahemi¹,

Vandamme²,

Garrido

et al. 2012

Talanta

View full text Add to dashboard Cite

show abstract

“…Additionally, it has been shown that MPEs have the ability for selective electrocatalysis of bromo-substituted aromatic substances depending on the position of substitution (50). Another step that has been taken further towards real application in the field of pesticide detection is the use of MPEs to determine the levels of propanil in simulated rice field environment by amperometry (51) and to monitor the activity of propanil by cyclic voltammetry (52). Electrodes modified with free base porphyrins do not produce significant current response in these detections proving the necessity of a metal ion at the center of the porphyrin molecule for electrocatalysis of halogenated aromatic hydrocarbons.…”

Section: Electrochemical Detection Of Halogenated Aromatic Substancesmentioning

confidence: 99%

Chemically Modified Electrodes for Detection of Pesticides

Navaratne¹,

Priyantha²

2011

Pesticides in the Modern World - Trends in Pesticides Analysis

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“…The goal of this research is to study the fate of propanil in a simulated rice field by means of a kinetic model for the determination and quantification of its primary degraded product, 3,4-DCA. As propanil is not electroactive at bare electrode surfaces, its direct electrochemical determination is not possible and consequently, electrodes modified with metalloporphyrin catalysts have been reported as a reliable means for its detection (Priyantha & Weerabahu, 1996;Priyantha et al, 2004). On the other hand, electroactivity of 3,4-DCA makes it possible to investigate the fate of propanil through the detection of 3,4-DCA.…”

Section: Introductionmentioning

confidence: 99%

Determination of the fate of propanil in a simulated rice field environment through electrochemical detection of 3,4-DCA

Ekanayake

Navaratne

Priyantha

2011

J. Natn. Sci. Foundation Sri Lanka

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Electrochemical investigation of 3,4dichlorophenylamine (3,4-dicholoroaniline or 3,4-DCA), the principal degraded product of propanil, in aqueous medium reveals that the most intense peak appears at +0.75 V vs. saturated calomel reference electrode (SCE). The diffusioncontrolled behaviour of this peak enables direct detection of 3,4-DCA in the environment, which can be extended for investigation of the fate of propanil. Rice cultivation grown in three beds of equal dimensions prepared in a polytunnel, an effective simulated environment to which the recommended dose of propanil was applied, was used for this study. Determination of the concentrations of 3,4-DCA throughout the rice cultivation cycle indicated that the concentration of 3,4-DCA initially increases up to 4 days followed by a decrease up to 10 days, and finally reaches a plateau. The concentration-time relationships of 3,4-DCA suggest that the initial degradation of propanil and subsequent degradation of 3,4-DCA follow the mechanism of consecutive reactions, where the product of the first step becomes the reactant of the second step. Further, comparison of kinetic data with integrated rate law expressions and the mathematical model of consecutive first order reactions indicated that the degradation of both processes is of first order with relatively low rate constants, being the degradation of 3,4-DCA as the rate limiting step.

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Amperometric Method for the Determination of Propanil in a Simulated Rice Field Environment

Cited by 3 publications

References 7 publications

Enhanced host–guest electrochemical recognition of herbicide MCPA using a β-cyclodextrin carbon nanotube sensor

Enhanced host–guest electrochemical recognition of herbicide MCPA using a β-cyclodextrin carbon nanotube sensor

Chemically Modified Electrodes for Detection of Pesticides

Determination of the fate of propanil in a simulated rice field environment through electrochemical detection of 3,4-DCA

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