Electrokinetic micropump having ion-exchange membranes

The invention is directed to the elimination of changes of the chemical composition of a pumped liquid caused by introduction of strange components or by modification of original components. Another object of the invention is to provide the possibility of use of electrodes of the first order in order to increase productivity and decrease size and cost of the micropump. For this purpose, the electrokinetic micropump comprises a multichannel structure 810 made of non-conducting material, for example, a piece of a polycapillary column. The inlet and outlet end of this structure are adjacent to electrode sections 803, 804 having openings 821, 822 for inlet and outlet of the pumped liquid. These sections are divided by ion-exchange membranes 811, 812 into chambers 813, 814 for flow of the pumped liquid, communicating with the ends 841, 842 of the multichannel structure, and chambers 815, 816 filled with an auxiliary medium for transfer of electric charges. In the latter electrodes 817, 818 are located. One of the membranes, namely, membrane 811, is monopolar, and its type corresponds to the polarity of the adjacent electrode 817. The other membrane, namely, membrane 812, is bipolar and faces the adjacent electrode 818 with its side that corresponds to the polarity of said electrode. On one or both sides of each ion-exchange membrane may be installed baromembranes 829, 830 for nanofiltration or reverse osmosis. As auxiliary medium may be used, in particular, the pumped liquid itself or a granulated ion-exchange material.