Penerapan Pendekatan Inkuiri untuk Peningkatan Hasil Belajar Siswa dalam Pembelajaran Ilmu Pengetahuan sosial Kelas IV di SD Negeri No 28 Gurun Laweh Kecamatan Lubuk Begalung Padang

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 bya 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(R2 =0.9876), 1.0 10 6–1.0 10 5 M(R2 =0.9836)and3.0 10 5–3.0 10 4 M(R2 =0.9827)withalimit of detection of 4.4 10 9 M.Theelectrode 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%