| 摘要 |
PROBLEM TO BE SOLVED: To solve such problem on a biosensor that the calcium ion of a river water or underground water to be measured, of which calcium ion concentration is 50 mg/L or more, is coupled with the carbonic ion of sodium bicarbonate in a buffer solution to generate water-insoluble calcium carbonate, which blocks a pipe within a device or adheres to the immobilized microorganism film, resulting in a deterioration in responsiveness or measuring sensitivity, and to provide an early stabilizable biosensor-applied water quality meter. SOLUTION: A sodium tetraborate aqueous solution to which sodium chloride, chelate-state iron, and magnesium ion are added is used as the buffer solution. By the use of this buffer solution, the reduction in sensor output at the start-up can be eliminated, and the monitoring can be stably performed for a long term even if the calcium ion concentration in water is high.
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