BOSTON -- Police and Homeland Security are investigating a possible deliberate contamination of a water cooler at South Boston High School.
The contaminated water cooler is in the main hallway of the school, and someone allegedly put epsom salt in the water, officials said.
A female student even went to fill her water bottle, but was told by another student that the water was poisonous.
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Magnesium sulfate
From Wikipedia, the free encyclopedia
Magnesium sulfate is a chemical compound containing magnesium, with the formula MgSO4. It is often encountered as the heptahydrate, MgSO4·7H2O, commonly called Epsom salt or Epsom salts. Anhydrous magnesium sulfate is used as a drying agent. Since the anhydrous form is deliquescent and therefore harder to weigh accurately, the hydrate is often preferred when preparing solutions, for example in medical preparations. Epsom salts have traditionally been used as a component of bath salts.
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Medical use
Locally it may be used as a treatment of an ingrown nail. Oral magnesium sulfate, or magnesium hydroxide, is used as a laxative. Epsom salts are also available in a gel form for topical application in treating aches and pains. Intravenous use is broadening, as magnesium sulfate reduces striated muscle contractions and blocks peripheral neuromuscular transmission by reducing acetylcholine release at the myoneural junction, as well as other effects.
More:
http://en.wikipedia.org/wiki/Epsom_salt