▎ 摘　　要

NOVELTY - Electrochemical sensor has a working electrode (130) and a reference electrode (150), where the working electrode has an insulating substrate layer (110), a conductive substrate layer, a transducer layer, and an ion selective membrane layer. USE - Electrochemical sensor. ADVANTAGE - The electrochemical sensor has low cost. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the different design of electrodes. 110Insulating substrate layer 130Working electrode 150Reference electrode