Gold nanoparticles/over-oxidized poly-eriochrome black T film modified electrode for determination of arsenic

A glassy carbon electrode, modified with gold nanoparticles/over-oxidized poly-eriochrome black T film, was fabricated for sensitive determination of As(III) by stripping voltammetry in an acidic medium. The electrode surface properties were characterized cyclic voltammetry, electrochemical impedance spectroscopy, scanning electron microscope (SEM), and X-ray photoelectron spectroscopy (XPS). demonstrated a good response towards As(III), detection 0.077 ?M linearity the range 0.1 to 10 (R2 = 0.9977). For placed different mineral water samples, acidified 0.75 M HCl solution, spiked various concentrations As(III). Spiked recoveries samples obtained 100.3%-105.0%. relative standard deviations lower than 4.0%.