Determination of As(III) by anodic stripping voltammetry following double deposition and stripping steps at two gold working electrodes

• Published in: Talanta (Oxford) 2015-11, Vol.144, p.517-521
• Main Authors: Korolczuk, Mieczyslaw, Ochab, Mateusz, Rutyna, Iwona
• Format: Article
• Language: English
• Subjects: Arsenic; Arsenic - analysis; Arsenic - chemistry; Determination; Double deposition; Electrochemical Techniques; Electrodes; Gold - chemistry; Lakes - chemistry; Limit of Detection; Rivers - chemistry; Stripping analysis; Water Pollutants, Chemical - analysis; Water Pollutants, Chemical - chemistry
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2015.06.084

The double deposition and stripping steps were proposed to minimize interference and increase the sensitivity in anodic stripping voltammetry of As(III). Two working electrodes of drastically different surface areas were used for the measurements. Arsenic was first deposited at the gold film electrode of a large surface area. When the deposition step at this electrode finished, the electrode was moved at a short distance to the second electrode consisting of four gold microelectrodes. The arsenic stripped from the first electrode was partially deposited at the microelectrodes and the analytical signal was obtained by its oxidation. Due to double deposition of arsenic the interference of Cu(II) was minimized and the detection limit of As(III) was lowered by one order of magnitude. The calibration graph was linear from 5×10−10 to 1×10−8molL−1 following deposition time of 300s at the first and the second electrode. [Display omitted] •The double deposition of As onto two gold working electrodes.•The very sensitive voltammetric procedure for determination of As(III) in water.•A new way of minimization interference from other metal ions.•The successful application for the analysis of river water.