Single-Piece Solid-Contact Pb ~(2+)-Selective Electrodes Based on Thiophene Oligomer

摘要

A single-piece solid-contact Pb ~(2+)-selective electrode was prepared by adding a thiophene oligomer into the ion-selective cocktail directly. The one-step fabrication yielded an electrode with Nernstian response spanning a wide concentration range of 10 ~(-3)-10 ~(-8)molL ~(-1), and detection limit as low as 5.6×10 ~(-9)molL ~(-1). The electrode had a quick response time of approximately 10-15s and showed excellent selectivity over the most common univalent and divalent cations. The practical application of the proposed electrode has been tested by determining Pb ~(2+) in real water samples.