February 2001 |
ToxFAQs™ |
for |
Chromium |
(Cromo) |
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This fact sheet answers the most frequently
asked health questions about chromium. For more information,
you may call the ATSDR Information Center at 1-888-422-8737.
This fact sheet is one in a series of summaries about hazardous
substances and their health effects. This information is important
because this substance may harm you. The effects of exposure
to any hazardous substance depend on the dose, the duration,
how you are exposed, personal traits and habits, and whether
other chemicals are present.
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HIGHLIGHTS: Exposure to chromium
occurs from ingesting contaminated food or drinking water
or breathing contaminated workplace air. Chromium(VI)
at high levels can damage the nose and can cause cancer.
Chromium has been found at 1,036 of the 1,591 National
Priority List sites identified by the Environmental Protection
Agency (EPA). |
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What
is chromium? |
Chromium is a naturally occurring element
found in rocks, animals, plants, soil, and in volcanic dust
and gases. Chromium is present in the environment in several
different forms. The most common forms are chromium(0), chromium(III),
and chromium(VI). No taste or odor is associated with chromium
compounds.
Chromium(III) occurs naturally in the
environment and is an essential nutrient. Chromium(VI) and
chromium(0) are generally produced by industrial processes.
The metal chromium, which is the chromium(0)
form, is used for making steel. Chromium(VI) and chromium(III)
are used for chrome plating, dyes and pigments, leather tanning,
and wood preserving.
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What
happens to chromium when it enters the environment? |
- Chromium enters the air, water, and soil mostly in the
chromium(III) and chromium(VI) forms.
- In air, chromium compounds are present mostly as fine
dust particles which eventually settle over land and water.
- Chromium can strongly attach to soil and only a small
amount can dissolve in water and move deeper in the soil
to underground water.
- Fish do not accumulate much chromium in their bodies from
water.
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How
might I be exposed to chromium? |
- Eating food containing chromium(III).
- Breathing contaminated workplace air or skin contact during
use in the workplace.
- Drinking contaminated well water.
- Living near uncontrolled hazardous waste sites containing
chromium or industries that use chromium.
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How
can chromium affect my health? |
Chromium(III) is an essential nutrient
that helps the body use sugar, protein, and fat.
Breathing high levels of chromium(VI)
can cause irritation to the nose, such as runny nose, nosebleeds,
and ulcers and holes in the nasal septum.
Ingesting large amounts of chromium(VI)
can cause stomach upsets and ulcers, convulsions, kidney and
liver damage, and even death.
Skin contact with certain chromium(VI)
compounds can cause skin ulcers. Some people are extremely
sensitive to chromium(VI) or chromium(III). Allergic reactions
consisting of severe redness and swelling of the skin have
been noted.
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How
likely is chromium to cause cancer? |
Several studies have shown that chromium(VI)
compounds can increase the risk of lung cancer. Animal studies
have also shown an increased risk of cancer.
The World Health Organization (WHO) has
determined that chromium(VI) is a human carcinogen.
The Department of Health and Human Services
(DHHS) has determined that certain chromium(VI) compounds
are known to cause cancer in humans.
The EPA has determined that chromium(VI)
in air is a human carcinogen.
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How
does chromium affect children? |
We do not know if exposure to chromium
will result in birth defects or other developmental effects
in people. Birth defects have been observed in animals exposed
to chromium(VI).
It is likely that health effects seen
in children exposed to high amounts of chromium will be similar
to the effects seen in adults.
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How
can families reduce the risk of exposure to chromium? |
- Children should avoid playing in soils near uncontrolled
hazardous waste sites where chromium may have been discarded.
- Although chromium(III) is an essential nutrient, you should
avoid excessive use of dietary supplements containing chromium.
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Is
there a medical test to show whether I've been exposed to chromium? |
Since chromium(III) is an essential element
and naturally occurs in food, there will always be some level
of chromium in your body. There are tests to measure the level
of chromium in hair, urine, and blood. These tests are most
useful for people exposed to high levels. These tests cannot
determine the exact levels of chromium that you may have been
exposed to or predict how the levels in your tissues will
affect your health.
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Has the federal government made recommendations to protect human health? |
EPA has set a limit of 100 µg chromium(III)
and chromium(VI) per liter of drinking water (100 µg/L).
The Occupational Safety and Health Administration
(OSHA) has set limits of 500 µg water soluble chromium(III)
compounds per cubic meter of workplace air (500 µg/m³),
1,000 µg/m³ for metallic chromium(0) and insoluble
chromium compounds, and 52 µg/m³ for chromium(VI)
compounds for 8-hour work shifts and 40-hour work weeks.
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References |
Agency for Toxic Substances and Disease
Registry (ATSDR). 2000. Toxicological
Profile for chromium. Update. Atlanta, GA: U.S.
Department of Health and Human Services, Public Health Service.
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Where can I get more information? |
ATSDR can tell you where to find occupational
and environmental health clinics. Their specialists can recognize,
evaluate, and treat illnesses resulting from exposure to hazardous
substances. You can also contact your community or state health
or environmental quality department if you have any more questions
or concerns. For more information, contact:
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Agency for Toxic Substances and Disease Registry
Division of Toxicology
1600 Clifton Road NE, Mailstop F-32
Atlanta, GA 30333
Phone: 1-888-42-ATSDR (1-888-422-8737)
FAX: (770)-488-4178
Email: ATSDRIC@cdc.gov
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