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The ingredient, perchlorate, has been found in at least 395 sites in 35 states at levels high enough to interfere with thyroid function and pose developmental health risks, particularly for babies and fetuses...
The EPA document says that mandating a clean-up level for perchlorate would not result in a "meaningful opportunity for health risk reduction for persons served by public-water systems."
Natural Formation of Perchlorates
There are several well-documented mechanisms for natural formation of perchlorate. Involving ozone or hydroxyl radicals as oxidizer for sodium chloride from the sea and are somewhat similar to the formation processes of iodates also present in the atmosphere.
As most perchlorates are readily soluble in water, an accumulation of perchlorates in the environment only occurs in arid areas with little or no rainfall. It is known since the beginning of the 20th century that the Atacama Desert not only contains large amounts of nitrates but also trace amounts of perchlorates. The concentration varies but is in the mg/kg range. The dry south west of the United States also shows accumulation of perchlorates. With the use of nitrates from the Atacama Desert, so called Chile saltpeter as fertilizer the chlorates were also distributed into the environment. As the Chile saltpeter was mostly substituted by nitrates produced by the Haber Bosch process, which contains no perchlorates this source of perchlorates nearly vanished.
In 2006 a mechanism for the formation of perchlorates was proposed which is particularly apropos to the discovery of perchlorate at the Mars Phoenix lander site. It was shown that soils with high concentrations of natural salts could have some of their chloride converted to perchlorate in the presence of sunlight and/or ultraviolet light. The mechanism was reproduced in the lab using chloride rich soils from Death Valley.
Originally posted by monkeybus
reply to post by keeb333
Lots of things, occur naturally, like the deadly Poison in apple seeds-Aresnic. And big tigers, Doesnt mean that it wont do you any harm
[edit on 23-9-2008 by monkeybus]