ELECTROCHEMICAL METHOD AND APPARATUS FOR DETECTING PH

Herein is disclosed a method for detecting pH, the method comprising: providing an electrode comprising a carbon material having at least one plane of carbon atoms, wherein the plane of carbon atoms has been oxidised at its edge, such that quinone structures or hydroquinone structures form part of the plane, contacting a sample with the quinone or hydroquinone structures of the plane of carbon atoms, carrying out an electrochemical test to reduce the quinone structures or oxidise the hydroquinone structures and determine the potential at which the reduction of the quinone structures occursor at which the oxidation of the hydroquinone structures occurs, using the potential at which the reduction or oxidation occurs to calculate the pH of the sample.. An apparatus for carrying out the method for detecting pH is also disclosed herein.