Bromine Incorporation in Regulated and Emerging DBPs and the Relative Predominance of Mono-, Di-, and Trihalogenated DBPs

摘要

Previous research has shown that bromine incorporation into trihalogenated acetic acids(TXAAs) was similar to that of the trihalomethanes (THMs). Likewise, occurrence data forother trihalogenated DBPs (e.g., halonitromethanes [HNMs], haloacetaldehydes [HAs]) showedsimilar or lower bromine incorporation as that of the THMs. Moreover, bromine incorporationpatterns into dihalogenated DBPs (e.g., haloacetic acids [HAAs], haloacetonitriles [HANs],HNMs, HAs) were similar or higher for the HANs. Some of the differences may have been dueto steric hindrance (i.e., trihalogenated DBPs containing bromine), relative instability of someDBPs, and/or the presence of DBPs at low levels relative to their minimum reporting levels.However, even when there was lower bromine incorporation into some DBP subclasses, thetrend was consistent (i.e., in most cases, the regression between DBP subclasses had a highcoefficient of determination). The relative formation of dihalogenated HAAs (DXAAs) andTXAAs has been related to the nature of the organic matter and/or the disinfectant(s) used. Thiswas also observed for various DBP classes. In addition, the relative degree of halogenation wasrelated to the instability of certain DBP species. Understanding the relative formation of