Device porous / insulating film / driver and analytical method based on electrochemiluminescence associated

An electrochemiluminescent analytical device, comprising a working electrode, and a structure in which: the material of the working electrode is a conductor or a semiconductor (11) so doped is covered with a layer (12) of electrically insulating whose band separation is greater than or equal to 5 eV, the working electrode is made of silicon or aluminum and the surface of silicon or aluminum it contains an oxide layer as layer (12) of electrical insulation, the thickness of the layer ( 12) of electrical insulator is 1 to 10 nm, the working electrode is adapted to serve as a cathode of the device, the device is adapted so as to apply drive pulses to the test sample, whereby the sample gives luminescence signal which is proportional to the amount of analyte in question, characterized by the working electrode of the device is supported by the structure, through the working electrode can connect to electronic excitation of a measuring instrument luminescence, a mechanically removable porous film (13) on the working electrode, wherein the film (13) porous liquid permeable and having a thickness of 1 to 100 .mu.m, and a liquid binding of less than 100 microns between the porous film (13) and the working electrode, the device so being adapted to sample and other reagents that are to take the film (13) porous and / or cathode can react with each other.