Research on the Determination of Hydroquinone in Wastewater with the Electrochemical Method

[Objective] The effect of the poly p-aminobenzene sulfonic acid modified electrode prepared with cyclic voltammetry method on the determination of the hydroquinone in wastewater was studied.[Method] The catalytic power of the poly p-aminobenzene sulfonic acid modified electrode prepared with cyclic voltammetry to hydroquinone was researched and its catalytic mechanism was explored.[Results] The poly amino acid modified electrode had obvious catalytic effects on hydroquinone and its was found that there was a good linear relationship between the oxidation peak current of it and the hydroquinone within the concentration scope of 1.0 × 10-6-8.0 × 10-5mol/L;the correlation coefficient:r=0.9894;and the detection limited valus,5.0 × 10-7 mol/L while it was quantitatively determined.The optimum measurement condition was as follows:the phosphate buffer solution with the pH value of 5.59 was used as the supporting electrolyte;and the voltage range was-0.1-0.3 V.The catechol and hydroquinone could be separated well with the determination of modified electrode.[Conclusion] The method of electrochemical determination of hydroquinone in wastewater was established,which was simple,fast,accurate and sensitive.