Microwell Microelectrode Filtration Sensor

A microwell microelectrode filtration sensor created by using an inert planar surface, which can be a metal pattern dry etched, to generate a filtration membrane with pores, generating a reactive metal surface layer as a working electrode. The electrode is within an area covering a filtration membrane, and makes one or more microwells added by a first layer of inert plastic of an effective working distance height and a second layer of a non-reactive metal of an effective microwell surface area to serve counter and/or reference an electrode. This is followed by at least one layer of inert plastic or metal.