| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a chemical concentration measuring method and a chemical concentration measuring apparatus that directly measure a change in the pH of a sample to be measured with a simple signal processing circuit without performing any complex operation on software. <P>SOLUTION: In a chemical concentration sensor 2, a sensitive film 2a coming into contact with the sample S to be measured is provided, and light L is illuminated while a bias voltage Vb to be applied to the sample S to be measured is appropriately adjusted, thus allowing photocurrent Is having a level corresponding to the chemical concentration of the sample S to be measured to flow. In this case, the measuring value of the photocurrent Is flowing to the chemical concentration sensor 2 is fed back to a potentiostat 4 in terms of a circuit, thus applying the bias voltage Vb where the photocurrent Is becomes a specific value Is<SB>0</SB>, and measuring the chemical concentration in the sample S to be measured according to the level of the bias voltage Vb. <P>COPYRIGHT: (C)2004,JPO |
