Development of an adsorptive catalytic stripping voltammetric method for the determination of an endocrine disruptor pesticide chlorpyrifos and its application to the wine samples

Abstract

A very sensitive voltammetric method for the determination of an endocrine disruptor Chlorpyrifos (CP) insecticide at ng mL -1 level was described. The pesticide was accumulated at a hanging mercury drop electrode (HMDE) and a well-resolved reduction peak was observed at -1.2 V (vs. Ag/AgCl) in pH: 2.0 media containing 5% aqueous ethanol solution. A systematic investigation of the solution parameters and operational parameters which affect the stripping response were carried out with differential pulse voltammetry. With an accumulation potential of -0.5 V and an accumulation time of 60 s, the detection and quantification limits were found to be 0.14 and 0.45 ng mL -1 , respectively. The remarkable sensitivity of the method was attributed to a catalytic process as concluded from cyclic voltammetry. The degree of interference from diverse ions and some other pesticides on the differential pulse stripping signal for CP was evaluated. The method developed was adapted for wine samples. The matrix effect of red wine was eliminated by means of liquid-liquid extraction (LLE) followed by solid-phase extraction (SPE) with satisfactory recovery values. This method offers a very sensitive and inexpensive way for determining CP residues in red wines.

A Versatilidade Do Eletrodo De Gota Pendente De Mercúrio Em Química Analítica – Uma Revisão Sobre Recentes Aplicações

“…101 Alguns mecanismos de reações envolvendo a redução eletroquímica de fármacos no HMDE estão listados na Tabela 2. foram estudados a fim de determinar a contaminação e persistência de defensivos utilizados nos cultivares. [109][110][111][112][113] Um método voltamétrico para a determinação do inseticida cifenotrina em formulações, vegetais e grãos foi desenvolvido por Kumar e Sreedhar. Pulso diferencial e o eletrodo HMDE foram empregados nas determinações voltamétricas em formulações, repolhos, tomates, trigo e arroz.…”

Recent Applications of Mercury Electrodes for Monitoring of Pesticides: A Critical Review

“…This radical is further reduced in the second step involving one electron and one proton. Similarly, chlorpyrifos can be determined at HMDE .…”

A Novel and Highly Sensitive Reduced Graphene Oxide Modified Electrochemical Sensor for the Determination of Chlorpyrifos in Real Sample

“…Therefore, a simpler, faster and, cost-efficient method is required to detect CPF (Huang et al, 2020). Electrochemical methods were employed for simple, fast and cost-efficient determination of CPF (Al-Meqbali et al, 1998;Manisankar et al, 2005;Pelit et al, 2011;Kumaravel et al, 2015;Sreedar et al,2015;Fischer et al J.,2016;Melo et al,2018;Joshi et al, 2020) Being one of the most prominent elements of the periodic table, carbon has a total of five allotropes including fullerene, carbon nanotube, graphene, graphite, and diamond. While diamond and graphite which have been known since ancient times are three-dimensional allotropes, nanotube discovered in the 90s is one-dimensional and fullerene is zero-dimensional.…”