Patent ID: 7608180

Claim:
A method for determining the concentration of H 2 O 2 in a sample containing H 2 O 2 , which method comprises: providing a sensor comprising 2 or 3 electrodes, one of the electrodes being coated with a ferricyanide compound which in reduced form functions as a mediator selective for hydrogen peroxide, wherein the ferricyanide compound has a low solubility in an aqueous phase, applying a potential of about −400 mV to the sensor, such that the oxidised form of the mediator is reduced to the reduced form, contacting the sensor with the sample, such that the H 2 O 2 oxidises the reduced form of the mediator to the oxidised form, maintaining the applied potential of about −400 mV such that the oxidised form of the mediator generating a current, measuring the generated current.