Trace lead analysis based on carbon-screen-printed-electrodes modified via 4-carboxy-phenyl diazonium salt electroreduction

► The sensor is a carboxy grafted carbon SPE obtained by electrochemical reduction of diazonium salt. ► Analytical performances for Pb(II) trace detection provided a LOD and a LOQ of 1.2×10−9 M and 4.1×10−9 M respectively. ► This sensor appears as a promising tool for environmental analysis.