PROBLEM TO BE SOLVED: To provide a method for stabilizing an active halogen sterilizer within a peroxide-containing aqueous solution system and a method for determining a peroxide concentration within the aqueous solution system in the presence of a sulfite and/or bisulfite.SOLUTION: In the provided method for stabilizing an active halogen sterilizer, an N-hydrogen compound such as 5,5-dimethylhydantoin, etc. is added to an active halogen sterilizer such as sodium hypochlorite, etc. prior to mixing of the active halogen sterilizer with a peroxide-containing aqueous solution system such as an aqueous hydrogen peroxide solution, etc. Also provided is a method in which an excess of an N-hydrogen stabilizing active chlorine compound such as 1-chloro-5,5-dimethylhydantoin, etc. is added to an aqueous peroxide (e.g., hydrogen peroxide) solution in which a sulfite and/or bisulfite exists so as to directly destroy the sulfite and/or bisulfite, a sulfite and/or bisulfite concentration is then determined by measuring a yet-to-be-reacted N-hydrogen stabilizing active chlorine compound content, and a peroxide compound concentration is subsequently determined.COPYRIGHT: (C)2015,JPO&INPIT【課題】過酸化物含有水溶液系中における活性ハロゲン殺菌剤の安定化方法、並びに亜硫酸塩及び/又は重亜硫酸塩の存在下における水溶液系中の過酸化物濃度を決定する方法を提供する。【解決手段】次亜塩素酸ナトリウム等の活性ハロゲン殺菌剤を過酸化水素水等の過酸化物含有水溶液系と混合する前に、該活性ハロゲン殺菌剤に5,5-ジメチルヒダントイン等のN-水素化合物を添加する活性ハロゲン殺菌剤の安定化方法、及び亜硫酸塩及び/又は重亜硫酸塩が存在する過酸化水素等の過酸化物水溶液において、過剰量の1-クロロ-5,5-ジメチルヒダントイン等のN-水素安定化活性塩素化合物を添加して亜硫酸塩及び/又は重亜硫酸塩を直接破壊し、次いで未反応のN-水素安定化活性塩素化合物量を測定することにより亜硫酸塩及び/又は重亜硫酸塩濃度を決定し、その後、過酸化物濃度を決定する方法。【選択図】なし
