Construction of a novel electrochemical sensor for the determination of tellurium in soil and water samples by Co nanoparticles-modified electrode

摘要

The spherical Co nanoparticles (Co-NPs) were successfully fabricated through a facile one-step reduction approach. Due to the large specific surface area and excellent electronic conductivity, Co-NPs displayed excellent electrochemical performance and exhibited high sensitivity towards the detection of Tellurium (IV). The electroanalysis of Tellurium (IV) on the modified electrode was investigated by differential pulse anodic stripping voltammetry. The peak currents of Tellurium (IV) increased proportionally within the range of 0.02-1.8 and 1.8-400 mg L-1 in the 0.1 M H2SO4 solution, under the optimal conditions. The detection limit was 0.2 mu g L-1 (S/N = 3). Moreover, the proposed method was successfully applied to determine Tellurium (IV) in real samples with satisfactory results. The Co-NPs/GCE not only showed good reproducibility, stability and anti-interference but also supplied a viable way for designing low toxic, environment-friendly and low-cost sensors to detect Tellurium (IV).