Inorganic arsenic speciation by differential pulse anodic stripping voltammetry using thoria nanoparticles-carbon paste electrodes

F J Pereira; M D Vázquez; L Debán; A J Aller

doi:10.1016/j.talanta.2016.02.011

Inorganic arsenic speciation by differential pulse anodic stripping voltammetry using thoria nanoparticles-carbon paste electrodes

Talanta. 2016 May 15:152:211-8. doi: 10.1016/j.talanta.2016.02.011. Epub 2016 Feb 3.

Authors

F J Pereira¹, M D Vázquez², L Debán², A J Aller³

Affiliations

¹ Department of Applied Chemistry and Physics, Area of Analytical Chemistry, Faculty of Biological and Environmental Sciences, University of León, Campus de Vegazana, s/n, 24071 León, Spain.
² Department of Analytical Chemistry, Faculty of Sciences, University of Valladolid, C/Paseo de Belén, no. 7, 47011 Valladolid, Spain.
³ Department of Applied Chemistry and Physics, Area of Analytical Chemistry, Faculty of Biological and Environmental Sciences, University of León, Campus de Vegazana, s/n, 24071 León, Spain. Electronic address: aj.aller@unileon.es.

PMID: 26992513
DOI: 10.1016/j.talanta.2016.02.011

Abstract

Two novel thoria (ThO2) nanoparticles-carbon paste electrodes were used to evaluate an anodic stripping voltammetric method for the direct determination of arsenite and total inorganic arsenic (arsenite plus arsenate) in water samples. The effect of Ag((I)), Cu((II)), Hg((II)), Sb((III)) and Se((IV)) ions on the electrochemical response of arsenic was assayed. The developed electroanalytical method offers a rapid procedure with improved analytical characteristics including good repeatability (3.4%) at low As((III)) concentrations, high selectivity, lower detection limit (0.1 μg L(-1)) and high sensitivity (0.54 μA μg(-1) L). The analytical capability of the optimized method was demonstrated by the determination of arsenic in certified reference materials (trace elements in natural water, trace elements in water and coal fly ash).

Keywords: Anodic striping voltammetry; Arsenic speciation; Cysteine; Differential pulse voltammetry; Thoria nanoparticles-modified electrode.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Arsenic / isolation & purification*
Arsenites / isolation & purification*
Carbon / chemistry
Electrochemical Techniques
Electrodes
Fresh Water / chemistry
Limit of Detection
Nanocomposites / chemistry
Nanocomposites / ultrastructure
Nanoparticles / chemistry*
Nanoparticles / ultrastructure
Thorium Dioxide / chemistry*
Water Pollutants, Chemical / isolation & purification*

Substances

Arsenites
Water Pollutants, Chemical
Carbon
Thorium Dioxide
arsenite
Arsenic