Glutathione modified screen-printed carbon nanofiber electrode for the voltammetric determination of metal ions in natural samples

• Glutathione was immobilized on CNF modified SPE through aryl diazonium electrografting.
• Better analytical performance are achieved when using GSH-SPCNFE instead of GSH-SPCE.
• The achieved LOD and LOQ were at µg L−1 levels for the simultaneous determination of Pb(II) and Cd(II) ions.
• GSH-SPCNFE was successfully used for metal ions determination in natural samples.

This work reports the development of a glutathione modified electrode via electrografting on a screen-printed carbon nanofiber substrate (GSH-SPCNFE). GSH-SPCNFE was compared to a classical screen-printed carbon electrode modified with glutathione (GSH-SPCE) for the simultaneous voltammetric determination of Cd(II) and Pb(II). Their electrochemical characterization and analytical performance suggest that SPCNFE could be a much better support for GSH immobilization. The applicability of GSH-SPCNFE for the determination of low concentration levels of Pb(II) and Cd(II) ions in environmental samples was successfully tested in a certified wastewater reference material by means of stripping voltammetry with a very high reproducibility and good trueness.

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