Glassy Carbon Electrode Modified with Citrate Stabilized Gold Nanoparticles for Sensitive Arsenic (III) Detection

Electrochemical determination of inorganic mercury and arsenic—A review

“…Chowdhury et al, (2007) reported the results of As(III) on a gold nanoparticle/polyaniline (PANI) modified glassy carbon electrode with detection limit of 0.4µg/L (Chowdhury et al 2007). A detection limit of 0.025µg/L, 0.047µg/L and 0.07µg/L was achieved with glassy carbon electrodes modified with gold nanoparticles (Gu et al 2013;Huang and Chen 2013;Lan et al 2012). Nano gold-crystal violet (CRV) film has been fabricated on glassy carbon electrode and indium tin oxide glass electrode.…”

Determination of Arsenic(III) at a Nanogold Modified Solid Carbon Paste Electrode

“…Colloidal gold solution was prepared according to literature reports 7, 13. It consisted to mix under stirring a gold solution at 1 mM (20 mL) and a solution of sodium citrate 38.8 mM (2 mL) during approximatively 5 min.…”

“…These features allow implementation for field measurements and arsenic content monitoring in decentralized zones 9, 10. Several electrodes including modified glassy carbon, platinum, boron‐doped diamond electrode, and mercury have been used for arsenic determination with gold being the best performing support for this purpose 7,11–13. Metallic gold electrodes exhibit, however, memory effects and a decrease in electrode performance over time 14–18.…”

“…Using a glassy carbon electrode chemically modified with gold nanoparticles stabilized by citrate anions, Lan et al. established a lower linear range (0.05–1 µg/L) in HCl 1 M medium using square wave adsorptive stripping voltammetry (SWASV) 7. A diamond thin‐film electrode coated with gold permitted the assay of As(III) down to 0.005 ppb 26.…”

Inorganic arsenic speciation by electroanalysis. From laboratory to field conditions: A mini-review

“…For example, LODs in the range 0.01-0.05 ppb are presented in [26,[36][37][38][39][40][41][42] and LOD lower than 0.005 ppb in [43][44][45][46][47][48]. A number of different approaches have been used to improve the sensitivity of detection:…”