Anodic Stripping Voltammetric Detection of Arsenic(III) at Gold Nanoparticle‐Modified Glassy Carbon Electrodes Prepared by Electrodeposition in the Presence of Various Additives
2008; Wiley; Volume: 20; Issue: 22 Linguagem: Inglês
10.1002/elan.200804339
ISSN1521-4109
AutoresMd. Motahar Hossain, Md. Mominul Islam, Sara Ferdousi, Takeyoshi Okajima, Takeo Ohsaka,
Tópico(s)Electrochemical sensors and biosensors
ResumoAbstract 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 H 2 SO 4 containing Na[AuCl 4 ] in the presence of KI, KBr, Na 2 S 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[AuCl 4 ] (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.
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