Journal
MICROCHIMICA ACTA
Volume 176, Issue 1-2, Pages 91-99Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-011-0698-9
Keywords
Bisphenol A; Polyaniline nanorods; Multiwalled carbon nanotubes; Electrochemical sensor
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Funding
- National Nanotechnology Center (NANOTEC) Thailand [P-09-00501]
- Center of Excellence for Innovation in Chemistry (PERCH-CIC)
- Commission on Higher Education
- Ministry of Education
- National Research University of Thailand
- Office the Higher Education Commission
- Trace Analysis and Biosensor Research Center
- Prince of Songkla University
- Department of Chemistry, Faculty of Science and Graduate School, Prince of Songkla University, Hat Yai, Thailand
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We report on a simple and highly sensitive amperometric method for the determination of bisphenol A (BPA) using pencil graphite electrodes modified with polyaniline nanorods and multiwalled carbon nanotubes. The modified electrodes display enhanced electroactivity for the oxidation of BPA compared to the unmodified pencil graphite electrode. Under optimized conditions, the sensor has a linear response to BPA in the 1.0 and 400 mu M concentration range, with a limit of detection of 10 nM (at S/N = 3). The modified electrode also has a remarkably stable response, and up to 95 injections are possible with a relative standard deviation of 4.2% at 100 mu M of BPA. Recoveries range from 86 to 102% for boiling water spiked with BPA from four brands of baby bottles.
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