Iridium and lead as vehicle emission pollutants: Their sequential voltammetric determination in vegetable environmental bio-monitors

► New analytical method for the simultaneous determination of Ir and Pb. ► Ir and Pb: elements linked to vehicle emissions, dangerous for the health. ► Use of vegetable matrices as environmental bio-monitors. ► Simultaneous voltammetric determination of Ir and Pb in vegetable bio-monitors. ► Voltammetric and spectroscopic measurements: critical comparison for validation.