Customized Screen-Printed Electrodes Based on Ag-Nanoseeds for Enhanced Electroanalytical Response towards Cd(II), Pb(II) and As(V) in Aqueous Samples

Electrochemical analysis based on screen-printed electrodes (SPEs) represents a great alternative to conventional analytical methods such as ICP-MS or LC-MS due their portability, sensitivity, selectivity, and cost-effectiveness. In addition, the functionalization of SPEs with nanomaterials has been reported provide an enhanced performance. this regard, silver nanoparticles (AgNPs) were synthesized appropriately characterized, showing spherical nanoseeds (Ag-NS) diameter 12.20 ± 0.04 nm. Using drop-casting methodology, AgNPs used modify carbon nanofiber (SPCNFEs). Ag-NS deposition onto electrode surface was confirmed by scanning electron microscopy (SEM). Furthermore, response modified (Ag-NS-SPCNFE) evaluated for determination trace Pb(II), Cd(II), As(V) using differential pulse anodic stripping voltammetry (DPASV), obtaining detection limits 3.3, 3.7, 2.6 µg L−1, Cd(II) As(V), respectively. Finally, Ag-NS-SPCNFE tested towards in spiked tap water sample, good agreement concentrations determined ICP-MS.