Arsenic (III) detection with underpotential deposition on gold

We report a new, sensitive stripping voltammetric method for the detection of As(III) in aqueous solution using either gold macroelectrode or nanoparticle-modified glassy carbon electrode (GCE) based on underpotential deposition (UPD) As ad-atoms. The pre-concentration step deposits and accumulates ad-atoms onto is followed by potential sweep to strip with no interference from Cu(II) Cl- at electrode. Linear responses were found range 0.01 μM 0.1 0.005 macroelectrodes electrodes, respectively. visually clearly discernable signals recorded (0.4 ppb) electrodes suggests that this has practical value given WHO limit 0.13 (10 drinking water.