A Simple and Sensitive Non Modified Acetylene Black-Polyurethane Composite Electrode in the Determination of Bisphenol-A in Water Samples

A new composite based on acetylene black (AB) and vegetable derivative polyurethane (PU) was prepared and evaluated in the determination of bisphenol A (BPA) in water samples using a differential pulse voltammetric procedure (DPV). DPV pulse amplitude of 50 mV, 10 mV s-1 scan rate and 0.10 mol L-1 phosphate buffer were selected for the analytical studies. An analytical curve was obtained with linear range of 0.1-10 µmol L-1 BPA and a limit of detection of 14.1 nmol L-1. The proposed electrode was used without modifiers and with high sensitivity and low-cost preparation in the determination of BPA in both tap and artesian well waters spiked with 0.30 µmol L-1, with relative errors of 0.81 and 1.0% and recoveries of 102 and 105%, respectively. Interferences from oxytetracycline, furosemide, catechol, methyl viologen chloride and fenitrothion could be overcome by appropriate current measuring, while diclofenac did not interfere.