Title: Sensitive electrochemical measurement of As (III) using Nafion modified platinum electrode via anode stripping voltammetry

Authors: Tung Son Vinh Nguyen; Tien Minh Huynh; Linh Duy Nguyen; Tin Chanh Duc Doan; Robert Baptist; Chien Mau Dang

Addresses: Institute for Nanotechnology (INT), Community 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, 700000, Vietnam; Vietnam National University Ho Chi Minh City (VNUHCM), Community 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, 700000, Vietnam ' Institute for Nanotechnology (INT), Community 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, 700000, Vietnam; Vietnam National University Ho Chi Minh City (VNUHCM), Community 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, 700000, Vietnam ' Institute for Nanotechnology (INT), Community 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, 700000, Vietnam; Vietnam National University Ho Chi Minh City (VNUHCM), Community 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, 700000, Vietnam ' Institute for Nanotechnology (INT), Community 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, 700000, Vietnam; Vietnam National University Ho Chi Minh City (VNUHCM), Community 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, 700000, Vietnam ' CEA-LETI, MINATEC Campus, Université Grenoble Alpes, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France ' Institute for Nanotechnology (INT), Community 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, 700000, Vietnam; Vietnam National University Ho Chi Minh City (VNUHCM), Community 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, 700000, Vietnam

Abstract: Arsenic (As) is considered to be one of the most toxic elements in water. Electrochemical techniques for the detection of As(III) have inherent advantages. In this study, a series of electrochemical experiments were performed in order to detect the concentration of As (III) ions in aqueous phase via Anode Stripping Voltammetry (ASV) technique by using a Nafion modified platinum electrode. The topology of the modified electrode was characterised with Atomic Force Microscopy (AFM). The electrochemical properties of the modified electrode were studied with ASV method and the optimisation parameters were determined: the amplitude of 0.02 V, frequency of 25 Hz, deposition time of 120 s. Under these optimised parameters, the linear response was in the range from 0 ppb to 40 ppb with high accuracy (R² = 0.9917). The responding time was approximately 150 s. The sensitivity of the modified Nafion/Pt electrode was 0.036 μA/ppb. The limit of detection was below 10 ppb which is approximately equal to the recommended level of World Health Organization (WHO). The results showed the possibility of using the modified Nafion/Pt electrode for the detection of As3+ in order to test the quality of domestic water.

Keywords: Nafion thin film; modified electrode; arsenic; ASV; anode stripping voltammetry.

DOI: 10.1504/IJNT.2020.111332

International Journal of Nanotechnology, 2020 Vol.17 No.7/8/9/10, pp.659 - 672

Published online: 20 Nov 2020 *

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