This article advocates for a revised risk
assessment for bromate to reflect presystemic
chemistry not usually considered when low-dose
risks are calculated from high-dose toxicology
data. Because of high acidity and the
presence of reducing agents, presystemic
decomposition of bromate can begin in the
stomach, which should contribute to lower-than-
expected doses to target organs. In this
research, bromate decomposition kinetics
with simulated stomach/gastric juice were
studied to determine the risk of environmentally
relevant exposure to bromate.
The current work is the first step in a
series of studies that the authors are conducting
to better estimate the hypothetical
low-dose risks to humans from drinking
water ingestion and thus arrive at more
appropriate maximum contaminant levels
(MCLs). It is the authors' belief that additional
kinetics and metabolism research will
demonstrate that the human risk from ingestion
of compounds in drinking water is less
than originally believed and will lead to
MCLs and MCL goals that are more scientifically
based.Includes 29 references, tables.