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Potentiometric plasticizer-free solid-contact Pb 2+ -selective electrodes based on copolymer methyl methacrylate- n -butyl acrylate (MMA-BA) as membrane matrix and multi-walled carbon nanotubes (MWCNTs) as intermediate ion-to-electron transducing layer have been developed. The disposable electrodes were prepared by drop-casting the copolymer membrane onto a layer of MWCNTs, which deposited on golden disk electrodes. The obtained electrodes exhibited a sub-ppb level detection limit of 10 -10 mol·L -1 . The proposed electrodes demonstrated a Nernstian slope of 29.1 ± 0.5 mV/decade in the linear range from 2.0 × 10 -10 to 1.5 × 10 -3 mol·L -1 . No interference from gases (O 2 and CO 2 ) or water films was observed. The electrochemical impedance spectroscopy of the fabricated electrodes was compared to that of plasticizer-free Pb 2+ -selective electrodes without MWCNTs as intermediated layers. The plasticizer-free MWCNTs-based Pb 2+ -selective electrodes can provide a promising platform for Pb(II) detection in environmental and clinical application.

Disposable Multi-Walled Carbon Nanotubes-Based Plasticizer-Free Solid-Contact Pb2+-Selective Electrodes with a Sub-PPB Detection Limit †