Electrochemical behavior and adsorptive stripping voltammetric determination of quercetin at multi-wall carbon nanotubes-modified paraffin-impregnated graphite disk electrode

摘要: Abstract Multi-wall carbon nanotubes-modified paraffin-impregnated graphite disk was fabricated by using choline bond and catalyzer (MWCNT/Ch/WGE), the properties were, respectively, investigated field emission scanning electron microscope (FE-SEM) X-ray photoelectron spectroscopy (XPS). Electrochemical behavior of quercetin studied in detail FE-SEM, UV-spectroelectrochemical various electrochemical methods, which related with two catechol hydroxyl groups other three groups, former is electron-donating group a proton reversible reaction, pH dependent. A highly sensitive adsorptive stripping voltammetric measurement (AdSV) for also shown at this electrode. On optimum conditions, response peak (E = 0.15 V, 3 min accumulation) proportional to concentration range 9.0 × 10−9 4.0 × 10−5 M. detection limit 4.8 × 10−9 M obtained signal-to-noise ratio (s/n) 3 good precision (R.S.D.: 2.1%, n: 9). Such attractive ability MWCNT/Ch/WGE suggests great promise amperometric sensor.