Determination of Bisphenol a with Poly (p-Aminobenzoic Acid) Modified Gold Electrode by Using Differential Pulse Voltammetry

Abstract

Bisphenol A (BPA) is important matter in chemical industry used in the produce of some foodcontact materials such as plastics, adhesives and coatings. But BPA has also some toxic effectsfor human endocrine system and environment. Therefore, novel sensitive and selective methodsfor determination the level of BPA in environmental, medical samples and foods newmeasurement methods need to be developed. A novel, sensitive, simple and cheapelectrochemical sensor based on poly (p-aminobenzoic acid) p(p-ABA) modified gold electrode(AuE) was developed for the measurement of BPA in water samples. Firstly, AuEs were modifiedwith polymerization of the p-amino benzoic acid as a monomer by using bulk electrolysis in 0.01M HCl at -250 mV. Then the electrochemical oxidation of BPA carried out in 0.1 M phosphatebuffer solution (PBS) pH=6 on p(p-ABA) modified AuE. The effects of various electrochemicalparameters, such as scan rate, electroyte type and electrolyte pH were examined. Differentialpulse voltammetry (DPV) was used as an ideal analytical method for the qualitative andquantitative detect of BPA in water samples. The developed electrochemical sensor has linearsignal to BPA in the range of 2–100 μM. Prepared electrode was showed the limit of detection(LOD) of 0.26 µM and R2 of 0.999. Additionally, the developed sensor s used to determinationthe BPA in bottled drinking water sold in Turkish markets by using DPV, and obtains satisfactoryresults. The recovery values of the bottle water samples in the freezer, at room temperature andin the car were calculated as 102.22%, 104.68% and 106.06% respectively.