Lead-selective poly(vinyl cholride) membrane electrode based on piroxicam as a neutral carrier

An ion-selective electrode (ISE) for lead based on piroxicam. as a suitable ionophor is described. The electrode responds to Pb2- in a linear range from 1.0 X 10(-5) to 1.0 X 10(-1) Mol l(-1) With a slope of 30+/-0.2 mV per decade and a detection limit of (4.0+/-1.0) x 10(-6) mol l(-1). The proposed electrode could be used in a pH range of 4.0-8.0. Selectivity coefficients were determined with the conventional fixed interference method (FIM), modified FIM combined with non-linear curve fitting of the Nickolskii-Eisenman equation and matched potential method (MPM). The electrode was successfully used for the direct determination of Pb2+ in solution and in potentiometric titration of Pb2+ ions. (C) 2002 Elsevier Science B.V. All rights reserved.