Simultaneous determination of catechol and hydroquinone by differential pulse voltammetry with graphene-ZnO composite modified glassy carbon electrode
JING Yan-feng1, LIU Zhi-min*1, CHEN Ming-tao1, ZHAN Hai-jun1, SHEN Qi2
1. College of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, China; 2. Department of Chemistry, Zhengzhou University, Zhengzhou 450001, China
A novel graphene-ZnO composite modified glassy carbon electrode (GR-ZnO/CHIT/GCE) was prepared by forming chitosan (CHIT) film. The electrochemical behavior of catechol and hydroquinone on the modified electrode was studied by cyclic voltammetry. Experimental results showed that the modified electrode presented higher catalytic properties on the electrochemical redox of catechol and hydroquinone in the 0.1mol / L B-R buffer solution(pH 4.0). Under optimized conditions,the differential pulse voltammetry was used for the determination of catechol and hydroquinone. The oxidation peak current showed a good linear relationship with concentration of catechol and hydroquinone in the range of 8.0 × 10-7 - 5.0 × 10-5 mol / L. The detection limit of catechol and hydroquinone were 2.0 × 10-7 mol/L (S/N = 3). The method was used to the determination of catechol and hydroquinone in simulated water samples with satisfactory results.
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