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MNN.COM > Eco-Glossary

Mercury

 
Mercury is a naturally occurring element that is found in air, water and soil. It is found in many rocks, including coal, which releases mercury into the environment when burned. Coal-burning power plants are the largest human-caused source of mercury emissions to the air in the U.S. Burning hazardous wastes, producing chlorine, breaking mercury products and spilling mercury, as well as the improper treatment and disposal of products or wastes containing mercury, also release it into the environment.
 
Mercury in the air eventually settles into water or onto land where it can be washed into water. A highly toxic form, methylmercury, builds up in fish, shellfish and animals that eat fish. Fish and shellfish are the main sources of methylmercury exposure to humans. Mercury exposure at high levels can harm the brain, heart, kidneys, lungs and immune system of people of all ages, which is why fish advisories are issued to inform and encourage people to continue to eat only fish that are low in methylmercury. (Source: EPA / Photo, liquid mercury: Wikimedia Commons)

Recent Stories


CFL bulbs with built-in armor: A bright idea?

Tue, Mar 16 2010 at 8:29 AM EST

ArmorLites are CFL bulbs with a special 'skin' that prevents mercury exposure if the bulb is broken. But is mercury exposure even something to worry about?


5 ways to dispose of old CFLs

Mon, Mar 15 2010 at 12:50 PM EST

Compact fluorescent light bulbs are a slam dunk when it comes to saving energy, but they contain mercury. Here's how to safely dispose of them.


New energy-efficient lighting technology contains no mercury

Wed, Feb 17 2010 at 6:10 PM EST

Researchers use nanofibers to create lights that are more energy-efficient than the common incandescent light bulb, more eco-friendly than a CFL — and they give off a warm white light, too.


Compact fluorescent lights: The mercury matter

Wed, Jan 27 2010 at 4:18 PM EST

Before you use CFLs in your home, be sure you understand what to do if a bulb breaks.


Fact or fiction? 7 eco-myths debunked

Wed, Dec 23 2009 at 10:00 AM EST

EPA: Toxic chemicals in freshwater fish widespread

Wed, Nov 25 2009 at 8:31 PM EST

Mercury — primarily released from coal-fired power plants — and PCBs found in all fish samples collected from 500 lakes, reservoirs from 2000-2003.


Which uses less mercury, incandescents or CFLs?

Tue, Sep 22 2009 at 10:38 AM EST

The numbers don't lie: Old-fashioned incandescent bulbs are responsible for creating a lot more mercury than compact fluorescent lights.


How much mercury is in the fish we eat?

Tue, Sep 22 2009 at 9:30 AM EST

Fish are one of the healthiest foods on Earth, but many are brimming with toxic mercury. MNN examines how this happens and which fish are still safe.


CFL vs. incandescent: Battle of the bulb

Tue, Jul 07 2009 at 5:00 AM EST

CFLs are more efficient than traditional light bulbs, but they also contain toxic mercury. MNN sheds light on which is the brighter pick.


A CFL and a recycling kit walk into a bar ...

Tue, Jun 02 2009 at 7:41 AM EST

With so much ado over the mercury found in CFLs, the WM LampTracker program makes disposing of them safely a piece o' cake.


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