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Configuration of EGFET pH sensor with different reference electrodes. (A) The schematic presentation (upper) and actual apparatus (lower) for the pH sensor with the Ag/AgCl reference electrode. (B) The schematic presentation (upper) and actual apparatus (lower) for the pH sensor with the external Au reference electrode. (C) Schematic presentation (upper) and actual apparatus (lower) for the pH sensor with the integrated Au electrode.
