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Arsenic
Description:
Most exposures to the heavy metal arsenic come from wood that is pressure-treated with Chromated Copper Arsenate (CCA), which is found in playgrounds, fences, decks and other constructions. (Manufacturers of CCA wood stopped producing in at the end of 2003, although stores can still sell the wood until the stockpiles are gone). Arsenic is a carcinogen and has been shown to cause lung, skin, bladder, liver, kidney and prostate cancer. Arsenic can also cause blood disorders, cardiovascular diseases, and is a known hormone disruptor that affects metabolism and immune function.
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From wikipedia: "Arsenic is notoriously poisonous to most multicellular life, due to the interaction of arsenic ions with protein thiols. Arsenic and its compounds, especially the trioxide, are used in the production of pesticides (treated wood products), herbicides, and insecticides. These applications are declining, however, as many of these compounds are in the process of being banned."
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