hazardous waste

-Cadmium is a naturally occurring element in the earth's crust.Pure cadmium is a soft silver-white metal.
-Cadmium is most off encountered in combination with other elements such as oxygen, chlorine, and sulfur.
#4. Ways to be exposed to cadmium?
-Small amounts of cadmium occur naturally in air, water, soil, and food
-Cadmium is passed along the food chain, bottom up.
-Phosphate fertilizers and sewage sludge increase cadmium levels in soil
-Burning of fossil fuels releases cadmium (coal and oil)
-EPA limits discharge amounts by companies into environment
-Maximum contaminant levels set for drinking water
-OSHA has established maximum and average exposure time limits to cadmium
-FDA limits amount used in ceramic plates, cups
-Chlorofluorocarbons (cfc's) are a family of compounds containing chlorine,
-Invented in 1920's as safe alternative to sulfur dioxide and ammonia refrigerants
. -They are unreactive, and have low flammability, plus low toxicity.
-Stable in atmosphere: very stable: 10 to more than 100 years.
-As solvents in cleaning electronic components and metals
-As blowing agents in foam plastic manufacturing
-CFC's are safe to use in the lower atmosphere, but the problem occurs when they
Drift to the upper atmosphere or stratosphere.
-Discovered in 1973 that CFC's damage ozone
– UV destroys CFC's and Chlorine is released which destroys ozone

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