| 摘要 |
PROBLEM TO BE SOLVED: To enable the long-term preservation of an electrochemical sensor in which a sensor part is constituted of an organic substance such as an enzyme with no depression in function by containing at least either one of copper or silver and chlorine in an aqueous medium be a stock solution. SOLUTION: In this method, an electrochemical sensor with an electrode system and a sensor part formed of an organic substance is preserved. The electrochemical sensor is immersed and supported in a stock solution containing at least either one of copper or silver and chlorine in an aqueous medium. As the stock solution contains chlorine, even in the case of using e.g. silver-silver chloride as an electrode, it is possible to prevent the elution of silver chloride into the stock solution from the electrode effectively. Furthermore, as the stock solution contains copper or silver it is possible to prevent the propagation of microorganisms in the stock solution and to preclude ill effects to the sensor part due to contamination accompanied by the propagation of microorganisms effectively. In addition, in the case of using nitrite in combination in the stock solution, it is possible to prevent the precipitation of silver and copper and to improve the keeping quality of the stock solution itself furthermore. |
