AN AMPEROMERTRIC MEASUREMENT METHOD FOR DETERMINING HYDROGEN PEROXIDE CONCENTRATION IN A FLUID SAMPLE,WITH THE AID OF ELECTRODES IN VITRO

摘要

An amperometric measurement method for determining the hydrogen peroxide concentration in a fluid sample with the aid of electrodes, in vitro, the method comprising: applying an activation potential so as to form a catalytic quantity of oxide on an electrode surface for shifting a potential for the measurement of hydrogen peroxide concentration into a cathodic range; applying a first measurement potential different than the activation potential that is suitable for measuring the hydrogen peroxide concentration in the fluid sample and which was shifted into the cathodic range by previously applying the activation potential, and measurement at the first measurement potential, such that the measurement potential is reduced, from at least +0.6V(NHE) to below +0.4V, applying at least a second measurement potential at which the current between the electrodes is nonlinear with respect to the hydrogen peroxide concentration but that is suitable for measuring a concentration of a substance in the fluid sample that acts as an interfering substance during measurement of the hydrogen peroxide concentration, and measurement at the second measurement potential; and estimating, based on the measurement at the second measurement potential an influence of the interfering substance on the result of the measurement at the first measurement potential.