Abstract
A highly sensitive electrochemical sensor for the simultaneous determination of catechol (CC) and hydroquinone (HQ) was fabricated by electrodeposition of gold nanoparticles onto carbon nanofiber film pre-cast on an Au electrode. Both CC and HQ cause a pair of quasi-reversible and well-defined redox peaks at the modified electrode in pH 7.0 solution. Simultaneously, the oxidation peak potentials of CC and HQ become separated by 112 mV. When simultaneously changing the concentrations of both CC and HQ, the response is linear between 9.0 μM and 1.50 mM. In the presence of 0.15 mM of the respective isomer, the electrode gives a linear response in the range from 5.0 to 350 μM, and from 9.0 to 500 μM for CC and HQ, respectively, and detection limits are 0.36 and 0.86 μM. The method was successfully examined for real sample analysis with high selectivity and sensitivity.
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We greatly appreciate the supports of the National Natural Science Foundation of China (No. 20775047).
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Fig. S1
The molecule structures of catechol and hydroquinone). (DOC 30.5 kb)
Fig. S2
CV of CC in 0.1 M phosphate buffer solution (pH 7.0) containing 4 mM analyte at bare Au electrode (a), GNPs/Au electrode (b), CNF/Au electrode (c) and GNPs/CNF/Au electrode (d). (DOC 95 kb)
Fig. S3
CV of HQ in 0.1 M phosphate buffer solution (pH 7.0) containing 4 mM analyte at bare Au electrode (a), GNPs/Au electrode (b), CNF/Au electrode (c) and GNPs/CNF/Au electrode (d). (DOC 93 kb)
Fig. S4
DPV of increasing concentrations of CC and HQ in phosphate buffer solution (pH 7.0): (a) 9.0, (b) 50, (c) 150, (d) 250, (e) 550, (f) 820, (g) 1500 μM. (DOC 111 kb)
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Huo, Z., Zhou, Y., Liu, Q. et al. Sensitive simultaneous determination of catechol and hydroquinone using a gold electrode modified with carbon nanofibers and gold nanoparticles. Microchim Acta 173, 119–125 (2011). https://doi.org/10.1007/s00604-010-0530-y
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DOI: https://doi.org/10.1007/s00604-010-0530-y