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Investigations into the Speciation of Inorganic Arsenic in Weakly Alkaline Medium by Voltammetry
Author(s) -
Zakharova Elza A.,
Noskova Gali.,
Moskaleva Marina L.,
Elesova Elena E.,
Wildgoose Gregory G.
Publication year - 2015
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201500034
Subject(s) - chemistry , sulfite , inorganic chemistry , arsenic , supporting electrolyte , reagent , voltammetry , anodic stripping voltammetry , cathodic stripping voltammetry , ammonium , electrolyte , electrochemistry , electrode , organic chemistry
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 (3 σ , t dep 40 s). Any interference from nitrate anions present at up to millimolar concentration was minimized by their photoreduction.