Journal
ELECTROANALYSIS
Volume 25, Issue 3, Pages 765-770Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201200592
Keywords
Bismuth; Modified electrodes; Stripping analysis; Nanoparticles
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Funding
- CNPq [478081/2010-3, 305227/2010-6]
- FAPEMIG [CEX-APQ-01856-10, CEX-PPM-00236-12]
- CAPES
- FAPESP
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We describe the preparation of bismutite ((BiO)2CO3) and bismuth-oxide (Bi2O3) plates-like nanostructures and their incorporation within graphite-composite electrodes for the determination of trace metals by anodic-stripping-voltammetry. The bismuth nanostructures were produced under microwave-hydrothermal conditions followed by thermal conversion of as-prepared precursor and characterized by X-ray diffraction, Fourier-transformed infrared and field-emission scanning-electron-microscopy. Graphite-composite electrodes bulk-modified with Bi2O3 nanostructures provided higher sensitivity and lower detection limits for determinations of cadmium, lead and zinc (0.26; 0.52; and 2.23 mu gL1, respectively) employing short deposition time (60s). The results indicate that the modification of graphite-composite electrodes with Bi2O3 nanostructures improved analytical characteristics of electrochemical sensors for trace-metal determinations.
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