Simultaneous determination of bisphenol A and hydroquinone using a poly(melamine) coated graphene doped carbon paste electrode

The authors describe an electrochemical sensor for simultaneous determination of bisphenol A (BPA) and hydroquinone (HQ). It is based on a carbon paste electrode doped with graphene and coated with poly(melamine) (PME/GR-CPE). The modified electrode exhibits excellent conductivity, electrooxidative activity and adsorptive capability. The differential pulse voltammetric peaks for HQ and BPA are separated by around 300 mV. Amperometric responses (at 0.5 V for HQ and 0.8 V for BPA; both vs. SCE) are linear for BPA in the 9.0 μM to 1.0 mM concentration range, and for HQ in the 7.0 μM to 1.0 mM concentration range. The respective detection limits are 10.5 nM and 74.0 nM. The sensor is reproducible, highly stable and sensitive. It was applied to the simultaneous determination of HQ and BPA in spiked tap water and waste water. Graphical abstract A sensor based on poly(melamine) coated on graphene-doped carbon paste electrode for simultaneous determination of bisphenol (BPA) and hydroquinone (HQ) was fabricated. The sensor possessed good reproducibility and high stability. The practical application of the sensor was demonstrated by the detection of HQ and BPA in tap water and wastewater samples.