Correlation between Electrochemical Impedance and Spectroscopic Measurements in Adsorbing Paraquat on Silver: Application in Underground Water Samples

Abstract

The electrochemical impedance spectroscopy (EIS) has been used to study the interaction between paraquat and carbon modified by silver (AgCPE) and silver particles‐impregnated natural phosphate (Ag/NPhCPE). This study was developed using spectrophotometry (UVVis) and infrared spectroscopy. The resulting interaction was controlled by adsorption at lower concentration (≤1.0×10−5 mol L−1) and by diffusion in the opposite case. Both electrodes are used to determining paraquat with a low detection limit (<1.0×10−12 mol L−1). The precision expressed as relative standard deviation RSD for the concentration level 1.0×10−5 mol L−1 of paraquat, (n=8) were 0.93 % and 1.1 % for Ag/NPhCPE and AgCPE respectively.

Graphene electrochemical transistors decorated by Ag nanoparticles exhibiting high sensitivity for the detection of paraquat over a wide concentration range

“…According to the report of previous work, Ag has a strong enrichment effect on PQ. 52,53 For the traditional electrochemical sensor, this strong enrichment is a double-edged sword. On the one hand, it can enhance the detection selectivity of the sensor and reduce the detection limit.…”

Extraction and determination of flubendiamide insecticide in food samples: A review

“…However, these approaches have drawbacks such as being time consuming, needing highly skilled personnel, and requiring the use of expensive instruments. Therefore, advanced approaches for the determination of pesticides were reported using sensor-based techniques such as electrochemical impedance spectroscopy (EIS) ( Lahrich et al, 2016 ), differential pulse voltammetry (DPV) ( Farahi et al, 2014 , 2015 , 2016 ), square wave anodic stripping voltammetry (SWASV) ( El Harmoudi et al, 2013 ), differential pulse anodic stripping voltammetry (DPASV) ( Elkasmi et al, 2016 ), and square wave voltammetry (SQW) ( Ajermoun et al, 2019 , 2020 ; El Harmoudi et al, 2017 ; El Mhammedi et al, 2010 ; El Mhammedi et al, 2007a , 2007b ; El Mhammedi et al, 2008 ; El Mhammedi et al, 2009 ). These electrochemical techniques are very sensitive and offer several advantages including low-cost, simplicity, rapid operation and low detection limits compared to the conventional chromatographic methods ( Laghrib et al, 2020 ).…”

Electrochemical Impedance Spectroscopic Investigation in Detecting 2,4‐dinitrophenylhydrazine Using Catalytic Effect of Copper at Glassy Electrode

“…This technique is an efficient tool to distinguish the complex electrochemical reactions, along with Faradic and non‐Faradic processes . These advantages make general application of EIS in various electrochemical systems .…”