An electrochemical detection of arsenic(III) solution was investigated by using a modified cobalt deposited on a silicon-based platinum electrode. The modified platinum-cobalt electrodes were prepared via electrode position process in varied deposition times. Surface morphology of modified electrode was investigated through FESEM. An electrocatalytic activity of arsenic solution on each deposited electrodes was examined with cyclic voltammetry (CV) at a potential range of -1.5 V to +1.5 V (vs.

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... seudo Ag/AgCl) in 0.1 M KOH supporting electrolyte. A voltammogram of arsenic(III) in different concentration was plotted and showed an increased peak current of arsenic(III) reduction, suggesting that the cobalt has high catalytic ability for arsenic reduction. R² values obtained from the linear regression equation of a modified Platinum-Cobalt electrode in 10s and 20s deposition time were 0.9976 and 0.9815, respectively. Various electrodeposition times showed a different morphology on electrode surfaces and affected the current signal of arsenic(III) reduction peak in cyclic voltammetry.