PROBLEM TO BE SOLVED: To provide a hypochlorous acid aqueous solution which can be used at a low concentration and further can suppress production amount of harmful organic chlorine compound since hypochlorous acid, to which attention has been recently paid, has far more excellent sterilizing deodorizing power than sodium hypochlorite, has weak acidity, can be used as a sterilizing deodorizing agent that is soft to a human body, reacts with impurities in city water or underground water used as dilution water to produce the organic chlorine compound, and is consumed also by self-decomposition to make high concentration.SOLUTION: About 12% of sodium hypochlorite is added and diluted to ultrapure water with specific resistance of 18 MΩ cm or more, about 9% of hydrochloric acid is added and diluted to the similar ultrapure water, and then the hypochlorous acid aqueous solution is obtained by blending both of them with each other. The hypochlorous acid aqueous solution, which has effective chlorine concentration of 50 to 15 mg/L and about pH 5, is prepared. Thus the hypochlorous acid aqueous solution, which is soft to an environment and the human body and which hardly decreases in the effect of the sterilizing deodorizing power, can be obtained.COPYRIGHT: (C)2013,JPO&INPIT【課題】最近注目されてきた次亜塩素酸は次亜塩素酸ソーダよりはるかに優れた殺菌消臭力があり、かつ弱酸性で人体にも優しい殺菌消臭剤として利用され始めているが、希釈水として水道水または地下水を利用していることより、不純物と反応し有機塩素化合物を生成し、また自己分解によっても消費されるため高濃度にすることにより、低濃度で使用することができ、その上有害な有機塩素化合物の生成量も少なくできる次亜塩素酸水溶液を提供する。【解決手段】比抵抗18MΩ・cm以上の超純水に約12%の次亜塩素酸ソーダを添加・希釈し、同様の超純水に約9%の塩酸を添加・希釈し、両者を混合して得られる次亜塩素酸水溶液で有効塩素濃度50~15mg/Lで、かつpH5前後の次亜塩素酸水溶液を調製する。環境や人体に優しくかつ殺菌消臭力の効能が減少し難い次亜塩素酸水溶液を得ることができる。【選択図】なし
