Voltammetric determination of bisphenol A in food package by a glassy carbon electrode modified with carboxylated multi-walled carbon nanotubes

• DOI: 10.1007/s00604-010-0512-0
• Publication Date: 2010-12-02T12:02:15Z
• Authors: Junhua Li; Daizhi Kuang; Yonglan Feng; Fuxing Zhang; Mengqin Liu
• Keywords: Nanochemistry; Glassy carbon; Linear range; Carbon fibers

A highly sensitive and mercury-free method for determination of bisphenol A (BPA) was established using a glassy carbon electrode that was modified with carboxylated multi-walled carbon nanotubes. A sensitive oxidation peak is found at 550 mV in linear sweep voltammograms at pH 7. Based on this finding, trace levels of bisphenol A can be determined over a concentration range that is linear from 10 nM to 104 nM, the correlation coefficient being 0.9983, and the detection limit (S/N = 3) being 5.0 nM. The method was successfully applied to the determination of BPA in food package.