No abstract

A new electrochemical sensor for hydroquinone (HQ) was prepared.

In this study, a novel and highly sensitive electrochemical method for simultaneous determination of catechol (CC) and hydroquinone (HQ) was developed, which worked at GCE modified with Nano cobalt (Nano-Co) by electrodeposition and L-Cysteine by electrochemical polymerization. The Nano-Co/L-Cysteine GCE was investigated by cyclic voltammetry (CV), SEM and EIS. The excellent conditions have been selected including supporting electrolyte, pH, accumulation time and scan rate. The calibration curves of were obtained that the linear regression equation was I = 0.0734c + 6 × 10 À 6 in the range of 5.8 μM to 103 μM (R 2 = 0.9942) for CC and the linear regression equation was I = 0.0566c + 5 × 10 À 6 in the range of 5.8 μM to 100 μM (R 2 = 0.9967) for HQ. The obtained detection limits of CC and HQ both were 6 × 10 À 7 M. The modified electrode was successfully applied to the simultaneous determination of CC and HQ in water samples.