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Atrazine

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Versie door Daphnisd (Overleg | bijdragen) op 27 aug 2009 om 10:49

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Definition of atrazine:
Atrazine is an organic compound which is widely used as a herbicide. Its use is controversial due to its effects on nontarget species, such as on amphibians. Its use was banned in the European Union in 2004 but it remains one of the most widely used herbicides in the U.S. . [1]
This is the common definition for atrazine, other definitions can be discussed in the article

Notes

Atrazine
Atrazine
Formula
C8H14ClN5

Atrazine was first used in the United States in 1959 where it currently still is one of the most widely used agricultural pesticides, with an annual production of over 35.000 tonnes. It is mainly used in sorghum, corn and sugarcane cultivation. It is released in the environment both from production sites as from its use as a herbicide.


Atrazine has a moderate water solubility of 30 mg/l and is therefore quite mobile the environment. It is also persistent with a half-life in water of 150 days, and an even longer one in the soil. It has a relatively low tendency to adsorb to soils or particles. Therefore, atrazine is expected to be present in surface water and groundwater. It also has a low tendency to evaporate to the atmosphere and might afterwards be deposited by rainfall, although it is rapidly degraded in the atmosphere.

It has a very low tendency to bioaccumulate and is therefore not expected to biomagnify through food chains.

It has a moderate toxicity in crustaceans and fish; concentrations above 3mg/l are necessary to induce acute lethal effects. Some fish and crustacean species can even tolerate Atrazine concentrations above 80 mg/l. Phytoplankton is more vulnerable as toxic effects occur at concentrations of only 60 µg/l. There have been reports that low concentrations of only 20 µg/l could change the behaviour of amphibians. Atrazine has also been suspected to induce endocrine disrupting effects in amphibians and mammals. [2]


Environmental standards and legislation

Included in the water framework list of priority substances


See also

Atrazine on ED North Database


References

  1. www.wikipedia.org August 13 2009
  2. Interim Reregistration Eligibility Decision for Atrazine, U.S. EPA, January, 2003.