Simultaneous determination of dihydroxybenzene isomers utilizing a thiadiazole film electrode

The present study reports a sensitive electro-analytical method for the simultaneous determination of dihydroxybenzene isomers by using a thiadiazole film electrode,which was readily prepared by electropolymerization of 2,5-dimercapto-l,3,4-thiadiazole on a glassy carbon electrode with cyclic voltammetry.The functionalized electrode has a distinguishable and sensitive response to dihydroxybenzene isomers.Under the optimized conditions,the linear stripping peak currents showed good linear relationships with hydroquinone,catechol and resorcinol at concentration ranges 0.50-120,0.50-110 and 1.00-110 μmol/L,and the detection limits are 0.1,0.1 and 0.3 μmol/L,respectively,The proposed method is applicable to the simultaneous determination of dihydroxybenzene isomers in real samples with the relative standard deviations of less than 5.7%and the recovery rates of 95.6%-106%.The constructed electrode is characterized by simple preparation,good selectivity,and high sensitivity advantages.