Development of Nano Poly(3-methyl thiophene)/Multiwalled Carbon Nanotubes Sensor for the Efficient Detection of Some Pesticides

Abstract

Foi construído um eletrodo baseado em eletrodo de carbono vítreo modificado por um filme de nanotubos de carbono de paredes múltiplas ((MWCNTs)/poli(3-metil tiofeno, P3MT), que foi usado na determinação diferentes classes de pesticidas por voltametria de redissolução de onda quadrada. Inclui-se herbicidas (isoproturon), inseticidas (voltage, cipermetrina, deltametrina, fenvalerato), e acaricidas (dicofol). O comportamento eletroquímico dos pesticidas selecionados foi investigado na superfície do nanocomposito P3MT/MWCNT/GCE, em pH 1, 4, 7, 9,2 e 13. Os voltamogramas cíclicos do isoproturon (ISO) e voltage (VOL) exibiram picos de oxidação bem definidos em pH 1, enquanto os outros exibiram pico de redução em pH 13. A determinação por voltametria de redissolução de onda quadrada dos pesticidas acima citados foi desenvolvida no mesmo sistema modificado e baixos limites de detecção foram obtidos. O procedimento analítico proposto foi aplicado em águas naturais aditivadas com os pesticidas selecionados para validar o procedimento desenvolvido.A modified electrode fabricated by coating multiwalled carbon nanotubes (MWCNTs)/poly(3-methyl thiophene, P3MT) film on a glassy carbon electrode (GCE) and was used for the adsorptive stripping voltammetric determination of different classes of pesticides. These include herbicide (isoproturon), insecticides (voltage, cypermethrin, deltamethrin, fenvalerate) and an acaricide (dicofol). Electrochemical behaviour of all the selected pesticides was investigated on P3MT/ MWCNT/GCE nano composite surface at selected pHs 1, 4, 7, 9.2 and 13. In cyclic voltammetry, isoproturon (ISO) and voltage (VOL) exhibited one well-defined oxidation peak at pH 1, while remaining pesticides gave one reduction peak at pH 13. Adsorptive stripping voltammetric determination of above-said pesticides was developed on the same modified system and lowest detection limits were achieved. The proposed analytical procedure was applied to natural water samples spiked with the selected pesticides to validate the developed stripping procedure.Keywords: nano sensor, poly(3-methyl thiophene), herbicide, insecticide, acaricide IntroductionSince the discovery of carbon nanotubes (CNTs) in 1991, 1 they have been considered one of the most promising materials for various applications. In recent years, CNTs have been applied in various fields such as energy storage, 2 actuators, 3 and sensors. 4 Especially, it opens a new door for electroanalytical chemistry field because of its large specific surface area and good capability of electron transfer. It has been reported that CNTs modified electrodes were successfully applied to determine many biological and organic molecules such as ascorbic acid and uric acid, 5 NADH, 6 amino acids, 7 rutin, 8,9 hydrazine, 10 H 2 O 2 , 11 adenine, and guanine. 12,13 In recent years, conducting polymer/CNTs-modified electrodes have been of great interest in electrocatalysis reactions because of their unique chemical and electrochemical properties. It has also been demonstrated that the in...

An Overview of Pesticide Monitoring at Environmental Samples Using Carbon Nanotubes-Based Electrochemical Sensors

“…The modification of the GCE surface with carbon nanotubes trapped into electrochemically prepared polymeric matrices was an approach explored by Li et al [85] and Sundari et al [86]. In the work of Li et al [85], it was designed as a GCE modified with MWCNT-polymeric methyl red film for the determination of carbendazim and using linear-sweep voltammetry; a detection limit of 9.0 nmoL −1 and satisfactory recoveries for water samples were achieved (between 90.3% and 94.7%).…”

“…In the work of Li et al [85], it was designed as a GCE modified with MWCNT-polymeric methyl red film for the determination of carbendazim and using linear-sweep voltammetry; a detection limit of 9.0 nmoL −1 and satisfactory recoveries for water samples were achieved (between 90.3% and 94.7%). Sundari et al [86] evaluated the electrochemical response of various pesticides (cypermethrin, deltamethrin, dicofol, fenvalerate isoproturon, and voltage) using a GCE modified with MWCNTs and poly(3-methyl thiophene (P3MT) film, which is a conducting polymer. As can be seen in Table 1, wide linear concentration ranges and low detection limits were reported using differential pulse adsorptive stripping voltammetry.…”

Nanobiotechnology in Agricultural Development

“…In crop fi eld, organophosphorus and carbamate degradation can be enhanced by TiO 2 nanoparticles. Some of the nanomaterials which are successfully used are multiwalled carbon nanotube coated electrodes (Sundari and Manisankar 2011 ), nanoparticle carbon electrodes with magnetic composite and nano-TiO 2 (Kumaravel and Chandrasekaran 2011 ). Nano-iron and nano-carbons are used for water and soil purifi cation and remediation (Karn et al 2009 ).…”

Nanotechnology and Food Industry

“…Currently, several authors are working in pesticide analysis methods' optimization. Magnetic composite nanoparticle-modified screen printed carbon electrodes (Gan et al, www.intechopen.com 2010), electrodes coated with multiwalled carbon nanotubes (Sundari & Manisankar, 2011) or nano TiO2 (Kumaravel & Chandrasekaran, 2011) are some examples of nanomaterials which have being successfully used. They all act as sensors of pesticides.…”