Anodic Stripping Voltammetric Detection of Arsenic(III) at Gold Nanoparticle‐Modified Glassy Carbon Electrodes Prepared by Electrodeposition in the Presence of Various Additives |
| |
| Authors: | Md. Motahar Hossain Md. Mominul Islam Sara Ferdousi Takeyoshi Okajima Takeo Ohsaka |
| |
| Affiliation: | 1. Department of Chemistry, University of Rajshahi, Rajshahi‐6205, Bangladesh;2. Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Mail Box G1?–?5, 4259 Nagatsuta, Midori‐ku, Yokohama 226‐8502, Japan;3. Department of Water Resources Engineering, Bangladesh University of Engineering and Technology, Dhaka‐1000, Bangladesh |
| |
| Abstract: | The simple, fast and highly sensitive anodic stripping voltammetric detection of As(III) at a gold (Au) nanoparticle‐modified glassy carbon (GC) (nano‐Au/GC) electrode in HCl solution was extensively studied. The Au nanoparticles were electrodeposited onto GC electrode using chronocoulometric technique via a potential step from 1.1 to 0 V vs. Ag|AgCl|NaCl (sat.) in 0.5 M H2SO4 containing Na[AuCl4] in the presence of KI, KBr, Na2S and cysteine additives. Surfaces of the resulting nano‐Au/GC electrodes were characterized with cyclic voltammetry. The performances of the nano‐Au/GC electrodes, which were prepared using different concentrations of Na[AuCl4] (0.05–0.5 mM) and KI additive (0.01–1.0 mM) at various deposition times (10–30 s), for the voltammetric detection of As(III) were examined. After the optimization, a high sensitivity of 0.32 mA cm?2 μM?1 and detection limit of 0.024 μM (1.8 ppb) were obtained using linear sweep voltammetry. |
| |
| Keywords: | Arsenic Gold nanoparticles Anodic stripping voltammetry |
|
|
