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Sensors 2007, 7(4), 578-588; doi:10.3390/s7040578

Article

A Sensitive Chemiluminescence Method for Determination of Hydroquinone and Catechol

Lijun Zhao ¹ , Baoqiang Lv ² , Hongyan Yuan ² , Zaide Zhou ¹  and Dan Xiao ^1,*

¹ College of chemistry, Sichuan University, Chengdu, 610064, P. R. China ² College of chemical engineering, Sichuan University, Chengdu, 610064, P. R. China

* Author to whom correspondence should be addressed.

Published: 26 April 2007

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Abstract: A novel flow-injection chemiluminescence(CL)method has been developedfor the determination of hydroquinone (HQ) and catechol (CT), based on their inhibition ofthe chemiluminescence reaction of luminol–KMnO₄–β-cyclodextrin (β-CD). It was foundthat β-cyclodextrin could effectively enhance the chemiluminescence produced from thereaction of luminol with KMnO₄ in basic media. The proposed method is simple, rapid,convenient and sensitive, has a linear range of 1–20 ng/mL for catechol with a detectionlimit of 0.4 ng/mL, and 1–10 ng/mL for hydroquinone with a detection limit of 0.1 ng/mL,respectively. The possible mechanism of the CL reaction is also discussed

Keywords: hydroquinone; catechol; chemiluminescence; flow injection analysis; determination

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