CeO2 nanoparticles modified screen-printed carbon electrode: Electrochemical sensing platform for sulfite determination in water samples

In the present work, the CeO2 nanoparticles (CeO2 NPs) were prepared by hydrothermal method and the crystal structure and morphology analysis were studied by using a series of characterizations. Then, the screen-printed carbon electrode (SPCE) modified with CeO2 NPs was employed to develop a simple and novel sensor for sulfite determination in water samples. The CeO2 NPs/SPCE showed significant current response for sulfite oxidation. The use of the developed sensor with differential pulse voltammetry (DPV) method provides a wide linear range for sulfite determination (0.08 to 870.0 µM) with a low limit of detection (LOD) (0.023 µM). Finally, the results determination of sulfite in water samples showed good recoveries between 96.7-102.7% with a relative standard deviation (RSD) less than 3.6%.