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Modified Screen-Printed Gold Electrode (SPGE) To Determine Imidacloprid<br />

Insecticide in Soil Samples<br />

Nur Amira binti Jaafar<br />

Supervisor: Dr. Azrilawani binti Ahmad @ Othman<br />

Bachelor of Science (Analytical and Environmental Chemistry)<br />

School of Marine and Environmental Science<br />

Universiti Malaysia Terengganu<br />

A method for the determination of imidacloprid insecticide in soil sample was<br />

developed using Screen-Printed Gold Electrode (SPGE) and measured with cyclic<br />

voltammetry technique. In this study, the surface of SPGE was modified with 11-<br />

mercaptoundecanoic acid (11-MUA) using Self-Assembled Monolayer (SAM). The<br />

surface morphology of SPGE were determine using Scanning Electron Microscopy<br />

(SEM). The SEM image was confirmed that 11-MUA was attached on the surface of<br />

SPGE. For the determination of imidacloprid insecticide on real sample, analysis of soil<br />

sample, taken from GM Peladang, Kuala Terengganu was carried out using both<br />

electrochemical and chromatographic techniques. The LOD and LOQ values of<br />

imidacloprid were obtained from calibration curve plotted using both mentioned<br />

techniques. The comparison study was confirmed by HPLC using a reversed phase C18<br />

column with a mobile phase of acetonitrile/water (v:v 4:1) at a flow rate 1.5mL/min<br />

and UV detection at 220 nm.<br />

1956 | UMT UNDERGRADUATE RESEARCH DAY 2018

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