An electroanalytical strategy for the simultaneous determination of ascorbic acid (AA) and dehydroascorbic acid (DHA), is described. A palladized Al electrode is used for hydrodynamic amperometry of AA. While the decrease of anodic stripping voltammetry current of the K 2 UO 2 [Fe(CN) 6 ]-Pd/Al electrode prepared in the presence of DHA was the principal of the DHA determination. The calibration graph for both methods was linear over the concentration range 1 -50 mM. The detection limit was found to be 0.5 mM. Some fresh fruit juices and vegetables of trace level of AA and DHA were analyzed as the typical example of application.