Patent ID: 6325917
Filing Date: 2001-12-04
Classification: G01N

Abstract:
A method for estimating the concentration of a reduced or oxidised form of a redox species in a liquid comprising the steps of:(1) contacting an area of a first electrode with a sample of predetermined volume of the liquid,(2) contacting the sample with an area of a second electrode spaced apart from the first,(3) applying a potential between the electrodes while the electrodes are sufficiently closely spaced that reaction products formed at each electrode diffuse to the other electrode while the potential is applied,(4) measuring or estimating a value indicative of the change in current as a function of time and a value indicative of the steady state current, and(5) determining from said volume, said current as a function of time, and said steady state current the concentration of reduced or oxidised form of the species in the liquid sample,the method characterized in that the sample of predetermined volume is a droplet deposited on one of said electrodes.