Arsenic detection from water using a silver-modified carbon nanotubes composite electrode

In this study, the protocol for arsenic (III) detection from an aqueous solution using stripping voltammetry on a silver-modified synthetic zeolite-carbonnanotubes-epoxy composite electrode (CNT-AgSZ) was elaborated. Three types of electrochemical techniques were used in order to optimize the operating conditions, i.e., cyclic voltammetry, differential-pulsed voltammetry and squarewave voltammetry. Also, the mechanistic aspects related to the electrochemical behaviour of arsenic (III) on the silver-modified synthetic zeolite carbon nanotubes epoxy composite electrode were elucidated by the effect of the scan rate using cyclic voltammetry. The lowest limit of detection achieved in this study for arsenic quantification by the proposed protocol allowed the application of this scheme for practical real application for water quality assessment and monitoring.