What is paradichlorobenzene?
Paradichlorobenzene is used as a fumigant insecticide to control
clothes moths. It is also found in deodorant blocks made for trash cans and toilets. Paradichlorobenzene was first registered for use in the United States in 1942, and it is sometimes called 1,4-dichlorobenzene.
What are some products that contain paradichlorobenzene?
Mothballs containing paradichlorobenzene are solids that turn into
toxic gas that kills moths. In 2010, there are over thirty products
registered with the U.S. Environmental Protection Agency that contain
paradichlorobenzene.
IMPORTANT: Always follow label instructions and take steps to minimize exposure. If any exposures occur, be sure to follow the First Aid instructions on the product label carefully. For additional treatment advice, contact the Poison Control Center at 800-222-1222. If you wish to discuss a pesticide problem, please call NPIC at 800-858-7378.
How does paradichlorobenzene work?
The vapor of paradichlorobenzene is toxic to insects. In humans and
other animals, paradichlorobenzene is broken down in the body to form
other compounds that may be harmful to cells or organs such as the
liver.
How might I be exposed to paradichlorobenzene?
You can be exposed to a pesticide if you breathe it in, get it on
your skin, or if you accidentally eat or drink something containing a
pesticide. This can happen if you get some on your hands and don't
wash them before eating or smoking. People are most likely to be
exposed to paradichlorobenzene by breathing in the vapors. When you
smell mothballs, you
are inhaling the pesticide. Small children and pets are at risk of
eating mothballs, because they look like candy or other treats.
What are some signs and symptoms from a brief exposure to
paradichlorobenzene?
People who have been exposed to paradichlorobenzene have
experienced nausea, vomiting, dizziness, fatigue, and
headaches. Paradichlorobenzene vapor can also irritate the eyes and
nasal passages. If paradichlorobenzene contacts the skin for a
prolonged period, it can cause a burning sensation. If a pet eats a
mothball made of paradichlorobenzene, they may have vomiting, tremors,
and/or abdominal pain. Paradichlorobenzene may also cause kidney and
liver damage in pets.
What happens to paradichlorobenzene when it enters the body?
In humans, paradichlorobenzene is distributed in the blood, fat,
and breast milk. It is broken down into several other chemicals by the
body and excreted in urine. Human volunteers who inhaled
paradichlorobenzene exhaled half the dose. The amount of
paradichlorobenzene in their blood dropped by more than 50% one hour
after the exposure stopped.
In animals, paradichlorobenzene is rapidly absorbed through the
lungs or gut, but more slowly through the skin. Paradichlorobenzene
was found in the fat, liver, and kidneys. Smaller amounts were found
in the blood plasma, lungs, and muscle. Paradichlorobenzene was
eliminated from the body soon after the exposure stopped. When animals
were exposed for long periods of time, their bodies began to break
down the paradichlorobenzene faster, and tissue levels declined.
Is paradichlorobenzene likely to contribute to the development of
cancer?
The World Health Organization (WHO) considered paradichlorobenzene
possibly carcinogenic to humans based on studies with mice. The way
paradichlorobenzene caused cancer in mice could possibly occur in
humans as well. The U.S. EPA has classified it as "not likely to be
carcinogenic to humans".
Has anyone studied non-cancer effects from long-term exposure to
paradichlorobenzene?
Rats and rabbits exposed to very high doses of paradichlorobenzene
vapor while pregnant gained less weight than control animals. In
another study, mother rats had fewer surviving young. No information
was found regarding paradichlorobenzene and asthma or other chronic
diseases.
Are children more sensitive to paradichlorobenzene than
adults?
While children may be
especially
sensitive to pesticides compared to adults, there are currently no
data to suggest that children have increased sensitivity specifically
to paradichlorobenzene. Young children may be more at risk of eating
mothballs because the mothballs may look like candy.
What happens to paradichlorobenzene in the environment?
Most of the paradichlorobenzene that gets into the environment will
turn into vapor. It can also be broken down by bacteria or become
attached to sediments in water. Paradichlorobenzene that binds to soil
may be taken up by plants, and plant leaves may absorb
paradichlorobenzene from the air. Paradichlorobenzene in air is broken
down slowly by other chemicals. It has been found in rainwater and
snow. Paradichlorobenzene has been found in groundwater close to a
source of contamination. In air, its half-life
is about 31 days.
Can paradichlorobenzene affect birds, fish, or other
wildlife?
When researchers fed 10 ducks a diet containing 0.5%
paradichlorobenzene for 35 days, three ducks died and the rest did not
grow as well. Paradichlorobenzene is moderate to low in toxicity to
fish, with differences in sensitivity by species. No information was
found for the effects of paradichlorobenzene on bees.
For more detailed information about paradichlorobenzene please visit the referenced resources below, call NPIC at 800-858-7378, Monday - Friday, 8:00am-12:00pm PT (11:00am-3:00pm Eastern Time), email us at npic@oregonstate.edu, or visit us at npic.orst.edu. NPIC provides objective, science-based answers to questions about pesticides.
Date Reviewed: December 2010
Please cite as: Gervais, J.; Luukinen, B.; Buhl, K.; Stone, D. 2010. Paradichlorobenzene General Fact Sheet; National Pesticide Information Center, Oregon State University Extension Services. npic.orst.edu/factsheets/PDBgen.html.
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NPIC fact sheets are designed to answer questions
that
are
commonly
asked by the general public about pesticides that are regulated by the
U.S. Environmental Protection Agency (US EPA). This document is
intended to be educational in nature and helpful to consumers for
making decisions about pesticide use.