Simultaneous Determination of m-Trihydroxybenzene and p- Nitrophenol at Glassy Carbon Electrode Modified with Graphene Oxide

摘要

A modified electrode was fabricated by casting graphene oxide (GO) suspension onto the surface ofactive glassy carbon electrode (GCE), and it can significantly enhanced the oxidation peak currents ofm-trihydroxybenzene (m-THB) and p-nitrophenol (p-NP). Based on this, a sensitive analytical methodtowards their simultaneous determination was established. Many influencing factors such as the typeof electrolyte, acidity, scan rates and concentrations were explored. Under the optimal experimentalconditions, the oxidation peak currents of m-THB and p-NP were linearly increased with theirconcentrations ranging from 9 to 100 M, with the detection limits both of 1 M. Comparing withother reported methods, this sensor showed wider linear range and lower detection limit. In addition,the proposed method was successfully used to analysis of real environmental water samples withsatisfactory recoveries, which verified the practicability of the sensor.