Electrochemical behavior of hydroquinone and catechol at a silsesquioxane-modified carbon paste electrode

摘要

A carbon paste electrode modified with 3-n-propyl-4-picolinium chloride silsesquioxane polymer was tested as a sensor for dihydroxybenzene isomers. The sensor showed excellent performance for simultaneous electroanalytical determination of hydroquinone and catechol. The calibration curves obtained were linear in the concentration range of 10.0 to 450.0 μmol L~1 for hydroquinone (r = 0.998) and 10.0 to 300.0 μmol L~(-1) for catechol (r = 0.997). The visual limit of detection was 10.0 μmol L~(-1) for both isomers.