LAUSR

In this study, a novel sensitive sulfabenzamide voltammetric sensor has been developed for use through fast Fourier transform square wave voltammetry (FFTSWV). This is achieved through the modification of a carbon paste electrode with Erbium(III) tungstate nanoparticles (Er2(WO4)3 NPs). The cyclic voltammogram of the analyte contained an irreversible oxidation peak at around 0.92 V vs. Ag/AgCl, which was used for the measurements. To achieve higher sensitivity, the effects of parameters such as, pH, quantity of the nanoparticles used, amplitude and frequency were also optimized. As a result, an optimal linear concentration range of 1.0×10 -6 –250.0×10 -6 M with a limit of detection 0.45×10 -7 M was reached. Characterization techniques such as transmission electron microscopy (TEM), and X-ray powder diffraction (XRD) were also used to study the size and morphology of the Er2(WO4)3 NPs. The sensor responses proved to have a good reproducibility and repeatability with acceptable RSD levels of (5.6%, 1.79% respectively), in addition to the long-term stability of almost one month.