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 an electrochemical determination of bisphenol A (BPA). The electrochemical performances of the modified electrodes for different pH values in phosphate and the Britton-Robinson buffers were determined by cyclic voltammetry; the electrode performances were better in the Britton-Robinson buffer. NiPcTS and CoPcTS modifications of the electrodes had remarkable enhancements on their performances. The differential pulse voltammetry parameters for the electrodes were optimized, and we 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) 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 determinations of BPA for analytical purposes.

Electrochemical Sensor Based on Spent Coffee Grounds Hydrochar and Metal Nanoparticles for Simultaneous Detection of Emerging Contaminants in Natural Water

“…In relation to BPA (Table 4), the sensor presented a lower LOD than many sensors reported in the literature [41][42][43][44], even those produced with more recognized and noble materials such as carbon nanotubes, graphene and silver [42,43]. The linear range was not as wide as some works [42,43], but it was similar to others [41,44] and could determine a good range of concentrations. The GC/HDC-CuNPs electrode was applied for the quantification of hydroxychloroquine sulfate and bisphenol A simultaneously in the natural water samples.…”

“…The HDC-CuNPs sensor is also cheaper than sensors produced with noble materials such as gold [39] and doped diamond [40]. In relation to BPA (Table 4), the sensor presented a lower LOD than many sensors reported in the literature [41][42][43][44], even those produced with more recognized and noble materials such as carbon nanotubes, graphene and silver [42,43]. The linear range was not as wide as some works [42,43], but it was similar to others [41,44] and could determine a good range of concentrations.…”