PERCHLORATE FOUND IN DAIRY AND BREAST MILK SAMPLES FROM ACROSS THE COUNTRY
February 23, 2005
FOR IMMEDIATE RELEASE
DATE: FEB. 23, 2005
CONTACT: Michael Bernstein,American Chemical Society, email@example.com
In a new study of breast milk and store-bought milk from across the United States,
scientists at Texas Tech University found perchlorate in every sample but one. The
results suggest that this thyroid-disrupting chemical may be more widespread than
The report was published Feb. 22 on the Web site of Environmental Science & Technology,
a peer-reviewed journal of the American Chemical Society, the world’s largest scientific
Perchlorate occurs naturally and is also a primary ingredient in solid rocket fuel.
The chemical, which has been showing up in many segments of the environment, can interfere
with iodide uptake in the thyroid gland, disrupting adult metabolism and childhood
The researchers, led by Professor Purnendu Dasgupta, Ph.D., of the university’s department
of chemistry and biochemistry, analyzed 47 dairy milk samples purchased randomly from
grocery stores in 11 states, and 36 breast milk samples from women recruited at random
in 18 states. Every sample of breast milk contained perchlorate, and only one sample
of dairy milk contained no detectable levels.
The average perchlorate concentration in breast milk was 10.5 micrograms per liter;
the dairy milk average was 2.0 micrograms per liter. No definitive national standard
exists, although the U.S. Environmental Protection Agency had suggested a limit of
1.0 micrograms per liter in drinking water.
The researchers also found that high levels of perchlorate correlated with low levels
of iodide in breast milk, which can inhibit thyroid function in nursing women—an essential
component for proper neural development of the fetus. Although the data are limited,
the levels of iodide in this study are sufficiently low to be of concern, according
to the researchers. They suggest that the recommended daily intake of iodine for pregnant
and nursing women may need to be revised upwards.
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