Patent ID: 8702963

Claim:
An electrochemical measuring method comprising: an electrochemical measurement electrode chip comprising (I) an electrochemical measurement electrode configured to carry out a CV (cyclic voltammetry) measurement of an electrochemical active substance in a sample solution containing a chloride ion, the electrochemical measurement electrode including (i) a working electrode, (ii) a counter electrode, (iii) a reference electrode made of silver and silver chloride, and (iv) a silver ion capturing material which captures a silver ion out of a silver chloride complex ion generated from the reference electrode, wherein the silver ion capturing material contains a cation-absorbent, and (II) a microchip which covers the electrochemical measurement electrode, the microchip having (i) a hollowed section which contains therein the working electrode and the reference electrode and (ii) an inlet section via which the sample solution is fed to the measurement section which is an area defined by the electrochemical measurement electrode and the hollowed section, the silver ion capturing material existing in the area defined by the electrochemical measurement electrode and the hollowed section, said electrochemical measuring method comprising the steps of: feeding the sample solution containing the chloride ion and the electrochemical active substance into the measurement section via the inlet section; and measuring the electrochemical active substance in the sample solution.