Analytical Sciences

Square Wave Voltammetry in the Determination of Ni²⁺ and Al³⁺ in Biological Samples

Alexandre T. PAULINO,* Alexandro M. M. VARGAS,** Lídia B. SANTOS,** Jorge NOZAKI,** Edvani C. MUNIZ,** and Elias B. TAMBOURGI*

*Universidade Estadual de Campinas, Departamento de Sistemas Químicos, Faculdade de Engenharia Química, Campinas-São Paulo, Brazil
**Universidade Estadual de Maringá, Departamento de Química, Maringá-Paraná, Brazil

In this contribution, the amounts of Ni (nickel) and Al (aluminum) in tilapias (Oreochromis niloticus) were determined using square wave voltammetry (SWV) with glassy carbon working microelectrode with a mercury thin film, platinum counter electrode, and Ag/AgCl reference electrode. Ni was studied through the formation of the dimethylglyoxime-Ni (Ni-DMG) complex, while Al was studied through the formation of the Alizarin R-Al complex. The detection limit found for Ni-DMG and Alizarin R-Al complexes were 1.70 × 10^-7 and 1.0 × 10^-8 mol L^-1, respectively. The voltammetric anodic curves for the Alizarin R-Al complex were recorded over the potential range from -0.8 to -0.05 V while the voltammetric cathodic curve for the Ni-DMG complex was recorded over the potential range from -0.7 to -1.2 V. These methods detected low concentrations of Ni and Al in biological samples efficiently.

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