Experimental interference liability studies on electrode geometry of aqueous solution sensors

Low-cost sensors to determine aqueous solutions are mostly constructed as an electrochemical cell with a two-electrode-system. Such a two-electrode-system can be realized with multiple geometric arrangements and shapes of the electrodes. The decision which arrangement and shape is best for the current application depends primarily on interference liability. In real applications criteria like producibility, probability of pollution and strain of the surface are also important. This paper shows the test results of six different two-electrode-systems regarding the mentioned criteria with focus on interference liability. The tests were executed under laboratory conditions by a frequency range between 40 Hz and 110 MHz.