Chemically Modified Electrodes for Detection of Pesticides

Navaratne, Ayanthi; Priyantha, Namal

doi:10.5772/17320

Cited by 4 publications

(5 citation statements)

References 42 publications

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“…In some cases, these systems are paired with other sensors as terminal detectors for insecticide detection [ 47 ]. In recent years, electroanalytical techniques have become more important in the environmental analysis because of their simplicity of operation, sensitivity, selectivity, and portability [ 49 ]. Besides, there are several electroanalytical techniques commonly used, such as potentiometry [ 50 ], conductometry [ 51 ], voltammetry [ 52 ], and amperometry [ 53 ].…”

Section: Public Health Agro-based Insecticides and Detection Approachesmentioning

confidence: 99%

Implications of biosensors and nanobiosensors for the eco-friendly detection of public health and agro-based insecticides: A comprehensive review

Samal

Mohanty

et al. 2023

Heliyon

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Section: Public Health Agro-based Insecticides and Detection Approachesmentioning

confidence: 99%

Implications of biosensors and nanobiosensors for the eco-friendly detection of public health and agro-based insecticides: A comprehensive review

Samal

Mohanty

et al. 2023

Heliyon

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Section: Introductionmentioning

confidence: 99%

“…Saveant [17] has developed a semi classical theory of concerted dissociative electron transfer based on the Morse curve approximation of the potential energy of the breaking bond and a Marcus-Hush solvent reorganization energy. Substantial literature on the transition between the concerted and stepwise types of dissociative ET processes has been developed [10]. Unfortunately, these studies followed by electronic structure calculations have described the excited dissociative curves [18,19] of only single carbon-halide σ bond cleavage in small organic compounds.…”

Section: Introductionmentioning

confidence: 99%

“…The catalyst can exist in the electrolyte solution or can be immobilized on the electrode surface, namely CME's or chemically modifi ed electrodes [1,10]. By modifying the surface of the electrodes by adsorption of molecules or ions, the surface reactivity and slow kinetics can be overcome [10].Mechanistically, the halogen atoms are removed in a successive fashion, along with a two electron transfer at more and more cathodic (negative) potentials. This has been proven for polyhalogenated aromatics [11] and remains under question for polyhalogenated aliphatics.…”

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confidence: 99%

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Disposal of Poisonous Organic Halides by Using the Electrochemical Method: DFT Simulation

Spataru¹,

Fernández²,

Sista³

et al. 2016

ChemJMold

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Abstract. Geometry optimizations at the UBP86/6-311++G** level of electronic structure theory have been performed for DDT, β-hexachlorocyclohexane, and heptachlor organic polychlorides as well for their positive and negative ions. The HOMO composition of these neutral molecules show no participation of the carbon-chlorine atomic orbitals, while LUMO of the calculated molecules include a major contribution of the anti-bonding character atomic orbitals from the two or three carbon-chloride bonds of each calculated molecule. Consequently, the negative ions were the most sensitive structure during the geometry optimization, showing the carbon-chloride bonds cleaving during the electronic structure calculations. Further geometry optimization of the obtained neutral intermediate molecules after the fi rst and second reducing by two electrons show that the electrochemical dehalogenation of the organic poychlorides is sequential.Keywords: poisonous pesticides, organic chlorides, electrochemistry, DFT, carbon-chloride bonds. IntroductionThe electrochemical method for disposal of halogenated organic compounds leads to complete mineralization of organic halides. Generally, the electro-reductive treatments using new, improved electrochemical sensors, lead to partial recovery/recycling of chemicals, are regarded as an advantageous [1]. Methods of chemical and electro-chemical oxidation applied to organic pollutants attain, in most cases, a complete mineralization, being considered to have highenergy requirements [2]. Reduction will not lead to a complete mineralization, but to a complete dehalogenation, with a possible formation of double bonds. This has been proven for organic halides with one [3,4], two [5,6], three [7], four [8] or six [9] halogen atoms in their structure.Dehalogenation reactions of halogen-alkanes have been studied by direct and indirect electrochemical reductions and classical kinetics. The electrochemical redox processes can be divided into two categories: direct (heterogeneous) and indirect or mediated (homogeneous) ones. Direct electrochemical reduction involves electrons accepted directly by the analyte from the cathode surface, while indirect electrochemical reduction occurs between the analyte and an electrogenerated species, which serves as catalyst. Some authors use the term "mediator" as an alternative for catalyst [1]. The catalyst can exist in the electrolyte solution or can be immobilized on the electrode surface, namely CME's or chemically modifi ed electrodes [1,10]. By modifying the surface of the electrodes by adsorption of molecules or ions, the surface reactivity and slow kinetics can be overcome [10].Mechanistically, the halogen atoms are removed in a successive fashion, along with a two electron transfer at more and more cathodic (negative) potentials. This has been proven for polyhalogenated aromatics [11] and remains under question for polyhalogenated aliphatics. The diffi culty of attaining suffi ciently cathodic potentials would explain why complete dehalogenation does not alway...

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“…Their main advantages are simplicity in operation, sensitivity, selectivity, portability and so on. Commonly used electroanalytical techniques are: potentiometry, conductometry, voltametry, amperometry etc [15]. The basic principles of these techniques are discussed below.…”

Section: Electroanalytical Techniquesmentioning

confidence: 99%

Developments in Analytical Methods for Detection of Pesticides in Environmental Samples

Bhadekar¹,

Pote²,

Tale³

et al. 2011

AJAC

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The present review gives a survey of all the published methods along with their advantages and limitations. Traditional methods like thin layer chromatography, gas chromatography, liquid chromatography etc are still in use for this purpose. But some recent bio-analytical methods such as immunosensors, cell based sensors etc. have also gained equal importance. This article also overviews various electro-analytical methods and their applications as detection devices when combined with FIA and biosensors. Lastly nanoparticle based biosensors have also been discussed. The review concludes with futuristic approach to reduce the risks caused by pesticides. This scrutiny should provide concise evaluation of different techniques employed for pesticide detection in environmental samples.

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Chemically Modified Electrodes for Detection of Pesticides

Cited by 4 publications

References 42 publications

Implications of biosensors and nanobiosensors for the eco-friendly detection of public health and agro-based insecticides: A comprehensive review

Implications of biosensors and nanobiosensors for the eco-friendly detection of public health and agro-based insecticides: A comprehensive review

Disposal of Poisonous Organic Halides by Using the Electrochemical Method: DFT Simulation

Developments in Analytical Methods for Detection of Pesticides in Environmental Samples

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