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Determination of Imidacloprid in Water Sample Using Modified
Screen-Printed Gold Electrode
Nur Anis Zafirah Binti Zainordin
Supervisor: Dr. Azrilawani binti Ahmad @ Othman
Bachelor of Science (Analytical and Environmental Chemistry)
School of Marine and Environmental Science
Universiti Malaysia Terengganu
An electrochemical method for the determination of IMI was developed using cylic
voltammetry (CV) on modified screen-printed gold electrode (SPGE). In this study,
self-assembly monolayer (SAM) was performed on the surface of SPGE with 11-
mercaptoundecanoic acid (11-MUA). Few parameters including type of supporting
electrolyte, scan rate and pH of supporting electrolyte were optimized. The modified
SPGE showed a high suppressed current against the potential due to the formation of
a monolayer on the electrode surface. Scanning electron microscopy (SEM) was used
to study surface morphology of the electrode before and after modification. SEM image
was confirmed that 11-MUA was present on the SPGE. The water sample was collected
at GM Peladang, Kuala Terengganu and two locations at UMT for the determination of
IMI in the real sample. The result obtained from CV was verified with the HPLC-UV.
The LOD and LOQ values of IMI were obtained from the calibration curve plotted using
both electrochemical and chromatographic techniques.
1957 | UMT UNDERGRADUATE RESEARCH DAY 2018