Abstract
Pristine activated carbon (AcC) was oxidized by H2O2 under ultrasonic conditions. Compared with pristine AcC, the H2O2-oxidized AC possesses higher accumulation ability to trace levels of Cd2+. Based on this, a highly sensitive, simple and rapid electrochemical method was developed for the determination of Cd2+. In 0.01 mol L−1 HClO4 solution, Cd2+ was effectively accumulated at the surface of H2O2-oxidized AcC modified paste electrode, and then reduced to Cd under −1.10 V. During the following potential sweep from −1.10 to −0.50 V, reduced Cd was oxidized and a sensitive stripping peak appears at −0.77 V. The stripping peak current of Cd2+ changes linearly with concentration over the range 5.0 × 10−8 to 5.0 × 10−6 mol L−1. The limit of detection was found to be 3.0 × 10−8 mol L−1 for 2-min accumulation. Finally, this new sensing method was successfully used to detect Cd2+ in waste water samples.
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Acknowledgment
The authors are grateful to the Natural Science Foundation of Hubei Provincial Department of Education (2002A00012) for financial support.
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Yi, H., Mei, P. Determination of cadmium (II) using H2O2-oxidized activated carbon modified electrode. J Appl Electrochem 38, 1623–1627 (2008). https://doi.org/10.1007/s10800-008-9605-4
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DOI: https://doi.org/10.1007/s10800-008-9605-4