Electrochemical determination of Pb2+ and Cd2+ with a poly(pyrrole-1-carboxylic acid) modified electrode

A pencil graphite electrode (PGE) was modified by the electropolymerization of pyrrole-1-carboxylic acid (Py-CO2) to form a sensing film poly(pyrrole-1-carboxylic acid) (PPy-CO2) for sensitive determination Pb2+ and Cd2+ differential pulse anodic stripping voltammetry (DPASV). The porous structure PPy-CO2 uniformly distributes carboxylate group throughout coating selectively coordinate preconcentrate metal ions. polymer characterized cyclic (CV), scanning electron microscopy (SEM), energy dispersive X-ray (EDS) Fourier transform infrared (FTIR) spectroscopy. Under optimized conditions (analyte solution pH: 6.0, extraction time: 15 min, reduction potential: −1.1 V 160 s), linear relationship between peak current concentration obtained from 0.1 1 nM with detection limits 0.018 0.023 nM, respectively. Simultaneous analysis performed in presence possible interfering ions Cr3+, Bi3+, Cu2+, Fe2+, Zn2+ Co2+ complex matrices. performance PPy-CO2@PGE demonstrated excellent intra-day repeatability, long-term reproducibility over seven-week period utilized variety natural water samples results independently verified inductively coupled plasma-mass spectrometry.