Electrochemical determination of bisphenol a with pencil graphite electrodes modified with Co(II), Ni(II), Cu(II) and Fe(II) phthalocyaninetetrasulfonates

Abstract

Pencil graphite electrodes modified with Co(II), Ni(II), Cu(II) and Fe(II) metallophthalocyaninetetrasulfonates (MePcTSs) were investigated for electrochemical determination of bisphenol A (BPA). Electrochemical performances of the modified electrodes for different pH values in phosphate and the Britton-Robinson buffers were determined by cyclic voltammetry and the electrode performances were better in the Britton-Robinson buffer. NiPcTS and CoPcTS modifications of the electrodes had remarkable enhancement on their performances. The differential pulse voltammetry parameters for the electrodes were optimised and found that the electrochemical response versus the concentration of BPA is linear from 5.0×10-7 to 1.0×10-5 M for the NiPcTS and CoPcTS modified electrodes. The detection limits of these modified electrodes are 2.9×10-7 M and 4.3×10-7 M, respectively and the effects of interfering species are less than 5%. The results show that NiPcTS and CoPcTS modified pencil graphite electrodes could be used for electrochemical determination of BPA for analytical purposes.