Aldrin

Aldrin is a organochlorine compound that was widely used as an insecticide and pesticide until it was banned in most countries in the 1990s. It is a colorless solid. Before the ban, it was heavily used in agriculture, particularly for cotton crops. Aldrin and related "cyclodiene" pesticides became notorious as persistent organic pollutants.

Chemistry

Aldrin is produced by combining hexachlorocyclopentadiene with norbornadiene in a Diels-Alder reaction to give the adduct. Similarly, an isomer of aldrin, known as isodrin, is produced by reaction of hexachloronobornadiene with norbornadiene.

Health Effects

Exposure to aldrin can occur by inhalation, ingestion, or skin contact. Aldrin is not likely to be absorbed through the skin, but it can affect the body if breathed in or eaten. It can cause headaches, dizziness, muscle weakness, and nausea. Long-term exposure can lead to more serious health effects such as liver damage, neurological damage, and possibly cancer.

Environmental Impact

Aldrin is a persistent organic pollutant: it is highly resistant to degradation, can be transported long distances by natural processes, and bioaccumulates in the environment. This means it can build up in animals, particularly those at the top of the food chain, to levels much higher than in the surrounding environment.

Regulation

Due to its toxicity and persistence, the use of aldrin is now banned in many countries, and it is listed for elimination in the Stockholm Convention on Persistent Organic Pollutants. However, it is still used in some countries for termite control.

See Also

• DDT
• Dieldrin
• Endrin
• Pesticide toxicity to bees

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