RAPID ELECTROCONCENTRATION IN A TUBE OF 25-40 MICROLITERS UNDER A RELATIVELY LOW APPLIED VOLTAGE

Electroconcentration can be performed using a very simple apparatus an d a simple operational procedure. The apparatus is composed of one tub e, two electrodes and a power supply. The total sample solution employ ed for electroconcentration was just 25-40 mu l. After a tube of silic one rubber (i.d. 1 mm, 30-50 mm long) was filled with a sample solutio n, an electric voltage was applied along the tube, and a charged solut e was forced to migrate to the end of the tube. With an application of 200-400 V for only 2-4 min, the concentration of the solute was enhan ced up to 10 times. In the present electroconcentration, the sample is concentrated in a few microliters. Electroconcentration by electrode transfer is also proposed.