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CAS Number: 75-47-8
Contaminant Type: Chemical

Iodoform is an organoiodine compound appearing in the form of bright yellow or yellow powder or crystals with a penetrating odor. Minimal levels of iodoform may be found in medical disinfectants. It is more primarily used for veterinary purposes [2602]. Iodoform is also among the iodo-trihalomethanes that may be formed as a result of disinfection of drinking water when iodide is present in raw water. Iodo-trihalomethanes can cause unpleasant medicinal and pharmaceutical taste and odor. For iodoform specifically, the odor and taste threshold concentrations of iodoform are 0.02 and 5 ug/l, respectively [2604]. It has been hypothesized that iodinated disinfection byproducts may be more carcinogenic than brominated species. Iodo-trihalomethanes, however, are not among the disinfection byproducts currently regulated by EPA. A nationwide study of disinfection byproduct occurrence found the highest levels of iodo-trihalomethanes at a plant that used chloramination without pre-chlorination, but found iodoform in only a limited number of samples [2603].

2602 National Center for Biotechnology Information; 2018; Iodoform; PubChem, National Institutes of Health; https://pubchem.ncbi.nlm.nih.gov/compound/iodoform#section=Top
2603 Weinberg, H., Kranser, S., Richardson, S., and Thurston, A.; 2002; The Occurrence of Disinfection By-Products (DBPs) of Health Concern in Drinking Water: Results of a Nationwide DBP Occurrence Study; National Exposure Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, Athens, GA; EPA/600/R-02/068
2604 Cancho, B., Ventura, F., Galceran, M., Diaz, A., and Ricart, S.; 2000; Determination, synthesis and survey of iodinated trihalomethanes in water treatment processes; Water Research; Volume 34, Issue 13, Pages 3380-3390