Electrochemical Determination of Trace Amount of Arsenic(Ⅲ) in Water with Nickel Oxide Nanoparticles Modified Electrode

Nickel oxide nanoparticles were electrodeposited on the surface of glassy carbon electrode (GCE) by cyclic voltammetry,to prepare NiO nanoparticles modified glassy carbon electrode (NiO-GCE).The structure and property of NiO-GCE were characterized by AC impedance and cyclic voltammetry.It was found that NiO-GCE showed effective catalytic property to As3+ at 0.9 V in PBS of pH 7.5.Linear relationship between values of oxidative peak current and concentration of As3+ was obtained in the range of 1.5×10-6-3.8×10-4mol·L-1,with value of detection limit (3S/N) of 5.0 ×10-7mol·L-1.