Abstract
An electrochemical sensor based on Nafion-multi-walled carbon nanotubes aerogel/gold nanoparticles modified graphene screen-printed electrode (Gr-SPE) for simultaneous electrochemical measurement of hydroquinone (HQ), catechol (CC) and resorcinol (RC) in citrate/phosphate buffer solution (CPBS, pH = 6.0) was introduced. The dihydroxybenzene (DHB) isomers could well separate from each other at the scan rate of 50 mV/s and the separations of the oxidation peak potentials of HQ-CC and for CC-RC were over more than 110 mV and 381 mV, respectively. Square wave voltammetry (SWV) was employed for the measurement of three DHB isomers in their ternary mixture. The linear response for HQ, CC and RC were 0.2-75 μM, 0.2–50 μM and 0.2–125 μM, respectively. The calculated detection limits were 0.014 μM, 0.017 μM and 0.05 μM (S/N = 3), respectively. The as-prepared sensing platform was applied to detect DHB isomers in real water samples (tap water, mineral water). The calculated recoveries were 96–100% for HQ, 95–100% for CC and 95–99% for RC, respectively.
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