BCDMH 4072963 216631728 2008-06-02T14:44:53Z ChemNerd 2246483 Quick-adding category "Hydantoins" (using [[WP:HOTCAT|HotCat]]) {{Chembox new | Name = BCDMH | ImageFile = BCDMH.png <!-- | ImageSize = 150px --> | ImageName = BCDMH | IUPACName = 3-bromo-1-chloro-5,5-dimethyl imidazolidine-2,4-dione | OtherNames = bromochloro-5,5-dimethylhydantoin, BCDMH, agribrom, aquabrom, aquabrome, bromicide, di-halo, halogene T30, nylate, photobrome, slimicide 78P | Section1 = {{Chembox Identifiers | CASNo = 126-06-7 }} | Section2 = {{Chembox Properties | Formula = C<sub>5</sub>H<sub>6</sub>BrClN<sub>2</sub>O<sub>2</sub> | MolarMass = 241.49 g/mol | Appearance = White solid | Density = 1.9 g/cm<sup>3</sup> | Solubility = 0.25 g/100 ml (25 °C) | MeltingPt = 158 °C - 165 °C | BoilingPt = }} | Section7 = {{Chembox Hazards | ExternalMSDS = [http://physchem.ox.ac.uk/MSDS/BR/1-bromo-3-chloro-5,5-dimethyl-2,4-imidazolidinedione.html External MSDS] | MainHazards = Flamability, Inhalation | NFPA-H = 3 | NFPA-R = 1 | NFPA-F = 1 | FlashPt = Decomposes at 160°C | RSPhrases = {{S8}}, {{S17}}, {{S26}}, {{S36}}, {{S37}}, {{S39}}, {{S41}}, {{S45}} }} }} '''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: The initial BCDMH reacts with water (R = Dimethylhydantoin): : BrClR + 2 H<sub>2</sub>O → [[hypobromous acid|HOBr]] + [[hypochlorous acid|HOCl]] + RH<sub>2</sub> Hypobromous acid partially dissociates in water: : HOBr → H<sup>+</sup> + OBr<sup>-</sup> Hypobromous acid oxidizes the substrate, itself being reduced to bromide: : HOBr + Live pathogens → Br<sup>-</sup> + Dead pathogens The bromide ions are oxidized with the hypochlorous acid that was formed from the initial BCDMH: : Br<sup>-</sup> + HOCl → HOBr + Cl<sup>-</sup> This produces more hypobromous acid. However, it should be noted that the hypochlorous acid itself does act directly as a disinfectant in the process. ==References== {{Citationstyle|date=September 2007}} <references/> * [http://www.chemjiheng.com/bcdmh/bcdmh.htm ] * [http://www.e1.greatlakes.com/common/msdspdf/00255.pdf ] * [http://www.dh.sa.gov.au/pehs/publications/code-bromine.pdf ] [[Category:Disinfectants]] [[Category:Organobromides]] [[Category:Organochlorides]] [[Category:Hydantoins]]