Abstract
An ion-selective electrode (ISE) for lead based on piroxicam as a suitable ionophor is described. The electrode responds to Pb 2+ in a linear range from 1.0×10 −5 to 1.0×10 −1 mol l −1 with a slope of 30±0.2 mV per decade and a detection limit of (4.0±1.0)×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 Pb 2+ in solution and in potentiometric titration of Pb 2+ ions.
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