Abstract
The speciation of inorganic forms of arsenic was studied using anodic stripping voltammetry (ASV) at a gold microelectrode in conjunction with photoreduction of As(V). Sodium sulfite (0.1 M) and ammonium buffer (pH≥9.5) were selected as both background electrolyte and photo-reductive reagent. Oxygen was removed by radical chain reactions with sulfite. The proposed speciation method was validated for mixtures of arsenic As(III/V) at concentrations up to 1 mg L−1. The calculated LOD of As(III/V) was 0.06 µg L−1 (3σ, tdep 40 s). Any interference from nitrate anions present at up to millimolar concentration was minimized by their photoreduction.
Original language | English |
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Pages (from-to) | 890-901 |
Number of pages | 12 |
Journal | Electroanalysis |
Volume | 27 |
Issue number | 4 |
Early online date | 12 Feb 2015 |
DOIs | |
Publication status | Published - Apr 2015 |
Keywords
- Arsenic speciation
- Anodic stripping voltammetry
- Gold microelectrode ensemble
- Photoreduction
- Sodium sulfite