Long, H.T. and Le, T.K.D. 2021. Glassy carbon electrode modified with ex-in-situ gold film – A simple and effective working electrode for As(III) determination by using differential pulse anodic stripping voltammetry. Hue University Journal of Science: Natural Science. 130, 1D (Dec. 2021), 23-29. DOI:https://doi.org/10.26459/hueunijns.v130i1D.6459.