DDT

DDT insecticide

Description

DDT

Common abbreviation for the Insecticide dichlorodiphenyltrichloroethane that was first synthesized in 1873. By 1939, Dr. Mueller discovered that the colorless, odorless crystals are toxic to insects, humans, and animals. Its successful use during World War II to combat insect carried diseases resulted in a Nobel Prize award to Dr. Mueller. In the United States, DDT was widely used as an insecticide in agriculture. Unfortunately, it was also used on many museum objects, such as plants and animals in ethnographic collections, as well as books and papers in libraries. Residues have also been found on wooden artifacts and musical instruments in museums. DDT is nonbiodegradable and its residues (DDE and DDD) may remain in or on objects for years. The breakdown of DDT may be catalyzed by some metals (Aluminum, Chromium, and Iron) and accelerated by light and heat. It was banned for use in the U.S. in 1972.

Chemical structure

Synonyms and Related Terms

dichlorodiphenyltrichloroethane; dicophane; chlorophenothane;

Product Names: D.D.T. [Geigy Co.]; Agritan; Azotox; Anofex; Ixodex; Gesapon; Gesarex; Gesarol [Ciba Geigy]; Guesapon; Neocid [Ciba Geigy]; Clofenotane

Risks

• Toxic by skin absorption, inhalation and ingestion. LD50 = 113-118 mg.kg
• Degradation produces chlorine and hydrogen chloride.
• Combustible.
• Potential carcinogen and mutagen.
• Biohazard.
• Echemi: SDS

Physical and Chemical Properties

Soluble in acetone, ether, benzene, carbon tetrachloride, kerosene, dioxane, and pyridine. Insoluble in water.

Composition	(ClC6H4)2CHCCl3
CAS	50-29-3
Melting Point	109 C
Density	1.5 g/ml
Molecular Weight	mol. wt. = 354.5
Boiling Point	260 C

Resources and Citations

• L. Goldberg, A History Of Pest Control Measures In The Anthropology Collections, National Museum Of Natural History, Smithsonian Institution, JAIC (35):23-43, 1996 (Link)

• Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993

• Lynda A. Zycherman, J.Richard Schrock, A Guide to Museum Pest Control, FAIC and Association of Systematics Collections, Washington DC, 1988

• Olympus Microscopy resource Center at http://www.olympusmicro.com/galleries/abramowitz/pages/ddtsmall.html - description states banned in US in 1972.

• Wikipedia: http://en.wikipedia.org/wiki/DDT (Accessed Jan. 25, 2006)

• Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997