| 摘要 |
PURPOSE:To hold a uniform concn. of silver ions, by a method wherein raw water is preliminarily subjected to deionization treatment and, after org. carboxylic acid is added to the treated water, the silver ion eluted in the first electrolytic cell is introduced into the second electrolytic cell where NaCl is added to form a complex. CONSTITUTION:Raw water is passed through an ion exchange substance such as an ion exchange resin to remove a Ca<2+> ion. Subsequently, 0.01-0.4wt.% of org. carboxylic acid is added to raw water and DC voltage is applied in the first electrolytic cell wherein silver is provided as an anode to form silver ion-containing raw water. Further, this raw water is passed through both of the anode chamber and the cathode chamber of the second electrolytic cell to obtain raw water containing a silver ion at desired concn. Subsequently, the raw water is introduced into a treatment tank where a predetermined amount of NaCl is added to change silver to a water-soluble complex. By this method, silver ion water having strong acting effect at low concn. can be easily obtained.
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