Nickel, cobalt in drinking water – Straightforward determination by voltammetry using a gold microwire electrode

Nickel is widely used in stainless steel production. It is known to cause skin allergies when getting in contact with. Drinking water may be contaminated by taps containing nickel. The guideline value for nickel in the World Health
Organization’s «Guidelines for Drinking-water Quality» is set to 70 μg/L. National limit values of typically lower at e. g. 20 μg/L. Cobalt usually occurs associated with nickel and can be found in smaller concentrations besides nickel.

Adsorptive stripping voltammetry is a viable, less sophisticated alternative to atomic absorption spectroscopy (AAS) for the determination of nickel and cobalt in drinking water. While AAS (and competing methods) can only be performed in a laboratory, adsorptive stripping voltammetric determinations can be used in the laboratory or alternatively in the field with the 946 Portable VA Analyzer. The determination is carried out on a bismuth film applied to the scTRACE Gold
electrode.