Polarographic Electrochemical Behaviour of 1,2,4-Trihydroxyanthraquinone-3 Carboxylic Acid

The electroreduction of 1,2,4-trihydroxyanthraquinone-3 carboxylic acid on the dropping mercury electrode (DME) is investigated.The research results of polarogram of the electroactive reagent show that at pH=3.9 the electrode process of one wave E1/2=-0.47V/SCE is controlled by diffusione.The electroactive reagent on DME needs two electrons and one hydrogen ion to produce the respective hydroquinone.The polarograhpy method can be used to analysis the concentration of the electroactive reagent.One possible reaction mechanism is proposed.