excellent article on the story of perchlorate
http://www.latimes.com/news/local/la-me-perchlorate29aug29,0,4030059.story?coll=la-home-localState Proposes Limit for Perchlorate in Drinking Water
The proposed limit is more stringent than the U.S. requires and would be enforceable.
By Marla Cone, Times Staff Writer
August 29, 2006
Perchlorate, a toxic ingredient of solid rocket fuel that is contaminating hundreds of wells throughout Southern California, would be limited in drinking water under a new state standard proposed Monday.
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Most of the water contamination comes from military bases and aerospace plants, where perchlorate was widely used as the explosive component of solid rocket propellants.
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More than 450 wells and other water sources operated by more than 100 water agencies in California — primarily in Los Angeles, Orange, Riverside, San Bernardino and Sacramento counties — have been contaminated by perchlorate, according to the state health department. One of the biggest tainted sources is the Colorado River, which supplies vast amounts of water to Southern California.
The chemical also has been widely found in milk, cheese, lettuce and other crops that are tainted by irrigation water, as well as human breast milk and baby formula.
and another article from Science news
http://www.sciencenews.org/articles/20060812/fob2.aspWeek of Aug. 12, 2006; Vol. 170, No. 7 , p. 99
Macho Moms: Perchlorate pollutant masculinizes fish
Janet Raloff
Known largely as a component of rocket fuel, perchlorate is a pollutant that often turns up in soil and water. In dozens of studies, it has perturbed thyroid-hormone concentrations, which can affect growth and neurological development. Data from fish now indicate that perchlorate can also disrupt sexual development.
Some of the changes were so dramatic that scientists initially mistook female fish for males. Several females displayed male-courtship behavior and produced sperm.
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The first sign of something amiss: Among perchlorate-exposed fish, many would-be dads lacked the electric-blue and red coloration that normally signals readiness to spawn. Most of these fish didn't exhibit typical reproductive behaviors, such as nest building, and many ignored prospective mates. Among clean-water males, 80 percent spawned. As the perchlorate concentration climbed from 30 to 100 ppm, successful spawning fell from 50 percent to zero.
Eventually, the bellies of three apparent males began swelling with eggs. They proved to be hermaphroditic females, bearing both fertile eggs and fertile sperm.
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