| abstract |
A concentration measuring apparatus includes an enzyme electrode which accelerates an oxidation reaction or a reduction reaction of a test substance in a liquid and outputs an electrical signal corresponding to a quantity of the test substance therefrom due to the reaction. The enzyme electrode is supplied with a reviving voltage for removing interfering substances on the enzyme electrode not only prior to concentration measuring but also according to a predetermined time interval. The reviving voltage has a polarity which is the reverse of the voltage used for concentration measurement. |