Electrochemical sensor based on screen-printed electrode for determination of organophosphate pesticide residues

Name: Kansuda Langor

Organization : Chulalongkorn University. Faculty of Science

Name: Orawan Chailaphakul

Organization : Chulalongkorn University. Faculty of Science

Name: Janjira Panchompoo

Organization : Chulalongkorn University. Faculty of Science

Email : Janjira.p@chula.ac.th

keyword: Organophosphate

LCSH: Pesticide residues in food

; Screen-printed electrode

LCSH: Pesticides -- Detection

LCSH: Information display systems -- Design and construction

Abstract: Methyl parathion (MP) is an organophosphate pesticide broadly used in agriculture to protect crops and fruits from the damages caused by insects and pests. However, when it is used in large quantities, it can be potentially toxic to humans and animals, causing many poisoning effects. Moreover, its residues can also penetrate into the food chain (via agriculture food products) as well as contaminating the environment, leading to air, water, and soil pollution. Therefore, rapid determination and reliable quantification of trace levels of MP are crucially needed for food safety and environmental monitoring. In this work, a low-cost and portable electrochemical sensor was simply developed using a screen-printed carbon electrode (SPCE) for the determination of MP residues with enhanced sensitivity. Typically, the SPCEs fabricated in-house were modified with polyaniline (PANI) using electro-polymerization technique, followed by the electrodeposition of gold nanoparticles (AuNPs), to obtain the AuNPs/PANI/SPCE sensor for MP detection. The modified AuNPs with electrocatalytic activity could increase the electrochemical performance of the detection, while the characteristics of PANI could make the sensor more conductive. The determination of MP was thoroughly investigated using the modified electrode by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Under optimal conditions, the AuNPs/PANI/SPCE showed high sensitivity, good stability, and reproducibility with an acceptable limit of detection (LOD). The proposed AuNPs/PANI/SPCE sensor could then be applied for MP detection in real samples with satisfactory recoveries.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2565

Modified: 2022-11-08

Issued: 2022-11-08

บทความ/Article

application/pdf

BibliograpyCitation : In King Mongkut's Institute of Technology Ladkrabang. Pure and Applied Chemistry International Conference (PACCON 2022) (pp.45-50). Bangkok : King Mongkut's Institute of Technology Ladkrabang

eng

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