It can be harmful if you breathe it. In nature, beryllium can be found in compounds in mineral rocks, coal, soil and volcanic dust. Purified beryllium is used in in electrical parts, machine parts, ceramics, aircraft parts, nuclear weapons and mirrors. Most beryllium in soil doesn't move up to the surface or into the groundwater. The central nervous system is the most sensitive to lead, but the kidneys and immune system are also susceptible.
Most lead comes from human activities such as mining, manufacturing and the burning of fossil fuels.
Chromium is an essential dietary nutrient, but some types of chromium are known carcinogens. High exposure to chromium can damage the nose, lungs, stomach, intestines, liver and kidneys. Send questions or comments to Webmaster .