Rapid voltammetric monitoring of trace As(III) using disposable injection-moulded sensors in a portable configuration

This work reports the fabrication of portable system for the determination of trace As(III) in water samples by mean of anodic stripping voltammetry (ASV). The portable detection system consists of a three-electrode mini cell featuring injection-moulded plastic conductive electrodes. As(III) accumulates on the disposable working electrode by electrolysis forming in situ an alloy with co-deposited gold. Then, the accumulated arsenic is detected by applying an anodic potential scan on the working electrode. The chemical and instru-mental conditions were studied and the analytical parameters for the determination of As(III) were estab-lished. The limit of detection was 0.2 mu g L-1 and the repeatability at the 5.0 mu g L-1 As(III) level (n = 10) was 4.7 %. The portable set-up was applied to different groundwater samples with recoveries between 95 and 105 %.

Automated summary

This paper reports the development of a portable system using anodic stripping voltammetry (ASV) for the determination of trace As(III) in water samples. The portable system consists of a three-electrode mini cell with plastic conductive electrodes. The accumulation of As(III) on the disposable working electrode and its subsequent detection by anodic potential scan were studied. The limit of detection was 0.2 μg L-1 and the repeatability at the 5.0 μg L-1 As(III) level was 4.7% (n = 10). The portable setup was successfully applied to analyze different groundwater samples with recoveries between 95% and 105%.