ELECTROCHEMICAL SENSOR IN CONFIGURATION THEREOF

The present invention refers to an electrochemical sensor for determining the presence and/or the concentration of a target analyte in an aqueous solution, comprising: a front electrode comprising pores permeable to the aqueous solution and comprising a sensitive surface to the target analyte; an electrolytic conductor bridge permeable to the aqueous solution; and a back electrode comprising at least a surface and optionally a support. The front electrode and the back electrode are electrically connected via the electrolytic conductor bridge and the front electrode comprises pores above 0.2 pm of equivalent diameter that connect the external surface of the front electrode and the electrolytic conductor bridge. The electrochemical sensor is configured so that the aqueous solution enters in contact with the back electrode through the electrolytic conductor bridge, which in turn enters in contact with the aqueous solution through the pores of the front electrode. The electrochemical sensor further comprises means for determining the difference in the electrochemical state between the front electrode and the back electrode; and the determination of such difference in the electrochemical state indicates the target analyte presence and/or concentration in the aqueous solution.