Inorganic arsenic speciation in natural mineral drinking waters by flow-through anodic stripping chronopotentiometry

Arsenic (III) Detection with Underpotential Deposition and Anodic Stripping Voltammetry

“…However, the detection of As(III) via ASV at conventional electrodes is subject to interferences by metal ions, including copper, lead, zinc, iron, silver, bismuth and mercury [1a] . The most commonly reported interfering ion is Cu 2+ , which can alter the stripping peak of As [17] . This interference has been ascribed to the formation of intermetallic compounds or a Cu−As alloy together with the similar reduction potentials of Cu(II) and As(III) noted by Idris et al [18] …”

Inorganic arsenic speciation by electroanalysis. From laboratory to field conditions: A mini-review

“…This may be done by changing the composition of the background solutions [48,77] and the measured signal (As 35); or by modifying the surface using M-NPs, their composites [37,51,58,[78][79][80], ligands (-SH, -NH 2 ) or organic membranes [11,38,40,44,49,56,80]. Other effective methods employ flowthrough systems [82] or cation exchangers [43,75,[83][84][85][86].…”

“…However, this requires that the conditions for obtaining these calibration curves are stable although they can vary from sample to sample. Nevertheless speciation analysis of arsenic has been carried out by a chronopotentiometry coulometric method (ASCP) in a flow-through cell [82]. Under conditions approaching complete electrochemical deposition and dissolution of the analyte species (non-calibrated ASCP) the amount of the accumulated material can be calculated directly from the acquired analytical signal using Faraday's law.…”