URIC ACID MEASURING METHOD USING DIAMOND MEMBRANE ELECTRODE SUBJECTED TO ANODIC OXIDATION TREATMENT, DIAMOND MEMBRANE ELECTRODE AND URIC ACID MEASURING SENSOR AND APPARATUS USING DIAMOND MEMBRANE ELECTRODE SUBJECTED TO ANODIC OXIDATION TREATMENT

摘要

PROBLEM TO BE SOLVED: To clearly discriminate between uric acid and ascorbic acid without causing a secular change. SOLUTION: A diamond membrane is set up in a 0.1 M KOH solution and a voltage of 2.4 V (vs. SCE) is applied to the diamond membrane for 75 min to perform the anodic oxidation of the diamond membrane. In this case, at an especially necessary time, a voltage of +4--4 V (vs. SCE) is applied in the 0.1 m KOH solution at a speed of 0.1 V/sea to perform sweeping three times and a voltage of 4 V is held for 1 min to perform anodic oxidation. When the diamond membrane thus anodically oxidized is used in a solution of uric acid and ascorbic acid, from DPV in this solution, it can be measured that a peak of uric acid(UA) is sharp and clear and a peak of ascorbic acid(AA) is broad and obscure. From this result, uric acid can be clearly detected if the anodically oxidized diamond membrane is used.