Anodic Stripping Voltammetry Using UPD Allows Sub 10 Ppb Measurement of Total as and As(III) in Water

24 Pages Posted: 7 Apr 2022

See all articles by Yifei Zhang

Yifei Zhang

affiliation not provided to SSRN

Richard Guy Compton

University of Oxford - Physical and Theoretical Chemistry Laboratory

Abstract

We report a sensitive stripping voltammetry method for the detection of total arsenic in aqueous solution using gold macroelectrodes based on the underpotential deposition (UPD) of As ad-atoms. The detection of As(III) or total arsenic can be selectively made by changing deposition potential, with detection of the total As content by deposition at high potential (- 1.3 V) and of As(III) by deposition at lower potential (- 0.9 V). Linear responses were found for both arsenic species in the range 0.01 μM to 0.1 μM at gold macroelectrodes. The analytical useful signals were recorded at concentrations as low as 0.01 μM (0.8 ppb) for both arsenic species suggesting that this method can be used to detect total arsenic concentrations in drinking water within the threshold value of the WHO of 0.13 μM (10 ppb).

Keywords: underpotential deposition, anodic stripping voltammetry, total arsenic detection, As(III)/As(V) speciation, electroanalysis

Suggested Citation

Zhang, Yifei and Compton, Richard Guy, Anodic Stripping Voltammetry Using UPD Allows Sub 10 Ppb Measurement of Total as and As(III) in Water. Available at SSRN: https://ssrn.com/abstract=4077551 or http://dx.doi.org/10.2139/ssrn.4077551

Yifei Zhang

affiliation not provided to SSRN ( email )

No Address Available

Richard Guy Compton (Contact Author)

University of Oxford - Physical and Theoretical Chemistry Laboratory ( email )

South Parks Road
Oxford, OX1 3QZ
United Kingdom

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