Simultaneous Determination of Catechol and Hydroquinone on Nano-Co/L-Cysteine Modified Glassy Carbon Electrode

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+6x10(-6) in the range of 5.8 mu M to 103 mu M (R-2=0.9942) for CC and the linear regression equation was I=0.0566c+5x10(-6) in the range of 5.8 mu M to 100 mu M (R-2=0.9967) for HQ. The obtained detection limits of CC and HQ both were 6x10(-7) M. The modified electrode was successfully applied to the simultaneous determination of CC and HQ in water samples.