Rahadian Zainul, Nurashikin Abd Azis, Illyas Md Isa, Norhayati Hashim, Mohamad Syahrizal Ahmad, Mohamad Idris Saidin, Siriboon Mukdasai
This paper presents the application of zinc/aluminium-layered double hydroxide-quinclorac (Zn/Al-LDH-QC) as a modifier of multiwalled carbon nanotubes (MWCNT) paste electrode for the determination of bisphenol A (BPA). The Zn/Al-LDH-QC/MWCNT morphology was examined by a transmission electron microscope and a scanning electron microscope. Electrochemical impedance spectroscopy was utilized to investigate the electrode interfacial properties. The electrochemical responses of the modified electrode towards BPA were thoroughly evaluated by using square-wave voltammetry technique. The electrode demonstrated three linear plots of BPA concentrations from 3.0 × 10 −8 –7.0 × 10 −7 M (R 2 = 0.9876), 1.0 × 10 −6 –1.0 × 10 −5 M (R 2 = 0.9836) and 3.0 × 10 −5 –3.0 × 10 −4 M (R 2 = 0.9827) with a limit of detection of 4.4 × 10 −9 M. The electrode also demonstrated good reproducibility and stability up to one month. The presence of several metal ions and organic did not affect the electrochemical response of BPA. The electrode is also applicable for BPA determination in baby bottle and mineral water samples with a range of recovery between 98.22% and 101.02%. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.
Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Negeri Padang, 25171, West Sumatera, Indonesia; Department of Chemistry, Faculty of Science and Mathemathics, Universiti Pendidikan Sultan Idris, Tanjong Malim, 35900, Perak, Malaysia; Nanotechnology Research Centre, Faculty of Science and Mathemathics, Universiti Pendidikan Sultan Idris, Tanjong Malim, 35900, Perak, Malaysia; Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand
