A novel amperometric sensor based on intercalated montmorillonite modified carbon paste electrode for hydroquinone determination

A simple and reliable amperometric sensor for hydroquinone (HQ) determination is developed based on an intercalated montmorillonite (MMT) modified carbon paste electrode (CPE). The modified CPE significantly enhances the peak current of HQ on cyclic voltammograms and differential pulse voltammograms. The electro-catalytic properties of the intercalated MMT can be attributed to the remarkably increased specific surface area of MMT after the intercalation process, which leads to a higher accumulation efficiency for HQ at this modified CPE. The modified CPE shows a linear range between 5 and 2000 mu M HQ with a correlation coefficient of 0.9997, and the detection limit is as low as 0.57 mu M (S/N = 3).