Employing a magnetic field to amplify zinc signal obtained at bismuth film screen-printed electrodes generated using dual bismuth precursor

• Two bismuth precursors were used for preparation of in-situ bismuth film screen-printed electrode.
• Favorable orientation of magnetic field allowed highly sensitive ASV determination of Zn(II) at BiFE-SPE.
• LOD and linearity for Zn(II) was better than those reported recently for BiF-SPE and Bi films.

Two precursors of bismuth film – Bi2O3 and Bi(III) ions – and a favorable orientation of the magnetic field were exploited to increase the Zn signals recorded at screen-printed electrodes modified with a bismuth layer. When using this configuration and an in-situ procedure, Zn(II) signals were better shaped and much more sensitive than those obtained for conventional bismuth-modified screen-printed electrodes. The developed procedure exhibits linear behavior from 4 to 199 μg l−1 Zn(II) with satisfying reproducibility (5%) and an low LOD of 0.05 μg l−1. The method was applied for the determination of Zn(II) in fly ash extracts and mineral waters.

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