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|Section2= |Section7= }} 1-Bromo-3-chloro-5,5-dimethylhydantoin (BCDMH) is a chemical structurally related to hydantoin. It is a white crystalline compound with a slight bromine and acetone odor and is insoluble in water, but soluble in acetone. BCDMH is an excellent source of both chlorine and bromine as it reacts slowly with water releasing hypochlorous acid and hypobromous acid. It used as a chemical disinfectant used for recreational water and drinking water purification. BCDMH works in the following manner:〔South Australian Health Commission, "Standard for the Operation of Swimming Pools and Spa Pools in South Australia", (Supplement C: Bromine Disinfection ), page 8. Retrieved on 2009-05-12.〕 The initial BCDMH reacts with water (R = Dimethylhydantoin): : BrClR + 2 H2O → HOBr + HOCl + RH2 Hypobromous acid partially dissociates in water: : HOBr → H+ + OBr− Hypobromous acid oxidizes the substrate, itself being reduced to bromide: : HOBr + Live pathogens → Br− + Dead pathogens The bromide ions are oxidized with the hypochlorous acid that was formed from the initial BCDMH: : Br− + HOCl → HOBr + Cl− This produces more hypobromous acid. However, the hypochlorous acid itself does act directly as a disinfectant in the process. ==Preparation== This compound is prepared by first brominating, then chlorinating 5,5-dimethylhydantoin: :505px 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「BCDMH」の詳細全文を読む スポンサード リンク
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