BCDMH
chemical compound
1-Bromo-3-chloro-5,5-dimethylhydantoin (BCDMH or bromochlorodimethylhydantoin) is a chemical structurally related to hydantoin. It is a white crystalline compound with a slight bromine and acetone odor and is sparingly soluble 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 for recreational water sanitation and drinking water purification. BCDMH works in the following manner:
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; the hypochlorous acid itself act directly as a disinfectant in the process.
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Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Sep 15, 2026. The linked authority identifier is Q2078825. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “BCDMH” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.