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Amperometric determination of bisphenol A in milk using ionic liquid-carbon nanotube composite electrode

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  131593622,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: http://dx.doi.org/10.13031/aim.20131593622) @2013
Authors:   Ling Zhou, Ping Jian Wang, Juan Du Li
Keywords:   Bisphenol A Ionic liquid Carbon nanotube Electrochemistry Milk samples

Abstract. A simply and sensitively electroanalytical method for the determination of bisphenol A (BPA) using ionic liquid n–octylpyridinum hexafluorophosphate (OPFP) and single–walled carbon nanotube (SWCNT) composite electrode was presented. This electrode combined the advantages of ionic liquid and SWCNT as well as the characteristics of the ‘‘bulk’’ composite electrodes. Compared with bare glassy carbon electrode (GCE) and other composite electrode using graphite or paraffin oil, the ionic liquid–SWCNT (IL–SWCNT) composite electrode not only significantly enhanced the oxidation peak current of BPA, but also lowered the oxidation overpotential, suggesting that the IL-SWCNT electrode can remarkably improve the determining sensitivity of BPA. Factors influencing the detection processes were optimized and kinetic parameters were calculated. Under the optimal conditions, the oxidation current increased linearly with increasing the concentration of BPA in the range of 1.0 µM to 50.0 µM with a low detection limit of 0.5 µM. Furthermore, the IL–SWCNT electrode was applied to determine BPA levels in milk samples. Experimental results showed that the proposed electrode could be used as an effective and sensitive sensor for the determination of BPA.

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