New Solid-State Organic Membrane Based Lead-Selective Micro-Electrode

摘要

Microfabrication, characterization and analytical application of a new thin-film organic membranebased lead-selective micro-electrode have been elaborated. Prior to the fabrication of the assembly, thegold thin-film substrate has been electrochemically treated using a new technique. The developedmicro-electrode based on tert-Butylcalix[4]arene-tetrakis(N,N-dimethylthioacetamide) as electroactivesensing material, carboxylated PVC as supporting matrix, 2-nitrophenyl octyl ether as solvent mediatorand potassium tetrakiss (4-chlorophenyl) borate as lipophilic additive, respectively, provides a nearly-6 Nernstian response (slope 280.5 mV/concentration decade) covering the concentration range 1x10 --2 -1 1x10 mole L of Pb(II) ions with reasonable selectivity over some tested cations. The merits offeredby the new microelectrode include simple fabrication, low cost as well as automation and integrationfeasibility. Moreover, the suggested microelectrode has been successfully applied for the determinationof lead ions in some aqueous samples. These samples were also determined using inductively coupledplasma atomic emission spectroscopy (ICP-AES) for comparison. The proposed electrode offers agood accuracy (the average recovery was 95.5%), high precision (RSD was <3%), fast response time( 4 months).