| Popis: |
The performance of screen-printed electrodes modified in situ with tellurium film for the anodic stripping voltammetric (ASV) determination of Cu(II) is reported. It was found that two types of screen-printed substrates, namely carbon and mesoporous carbon, were optimal for this application. The selected in situ tellurium film modified electrodes were applied for the square wave ASV determination of copper at μg L−1 concentration levels. Well-defined and reproducible Cu oxidation stripping peaks were produced at a potential more negative than the anodic dissolution of tellurium. The highest sensitivity of Cu determination was achieved in 0.05 M HCl containing 50 μg L−1 Te(IV) after 300 s of accumulation at −0.5 V. Using the optimized procedure, a linear range from 2 to 35 μg L−1 of Cu(II) was obtained with a detection limit of 0.5 μg L−1 Cu(II) (S/N=3) for 300 s of deposition time. Both sensors, carbon TeF-SPE and mesoporous carbon TeF-SPE, were successfully applied for the quantification of Cu in a certified reference surface water sample. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim |
