Journal
MICROCHIMICA ACTA
Volume 171, Issue 1-2, Pages 139-144Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-010-0409-y
Keywords
Hydrogen peroxide; Thionin; Multiwalled carbon nanotubes; Chitosan; EDTA
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Funding
- National Science Foundation of China [20871089]
- Education Department of Anhui Province [KJ2010ZD09, KJ2010B227]
- Foundation of Anhui Provincial Education Department [2009SQRZ172]
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A sensitive amperometric sensor has been constructed for the determination of hydrogen peroxide (HP). It is based on a glassy carbon electrode modified with a composite made from thionin, EDTA, multiwalled carbon nanotubes, and chitosan. Thionin was covalently immobilized on the surface of the electrode. The sensor exhibits a powerful electrocatalytic activity for the reduction of HP. The amperometric signal is proportional to the concentration of HP in the range from 0.2 mu M to 85.0 mu M, with a detection limit of 0.065 mu M. The sensor displays excellent selectivity, good reproducibility and long-term stability.
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