Chemical Fact Sheet

Chemical Abstract Number (CAS #) 60571
CASRN 60-57-1
2,7:3,6-Dimethanonaphth(2,3-b)oxirene, 3,4,5,6,9,9-hexachloro-1a,2,2a,3,6,6a,7,7a-octahydro-,
1,2,3,4,10,10-Hexachloro-6,7-epoxy-1,4,4a,5, 6,7,8,8a-octahydro-endo,exo-1,4:5,8-dimethanonaphthalene
Analytical Methods EPA Method 505
EPA Method 508
EPA Method 608
EPA Method 617
EPA Method 625
EPA Method 8081
EPA Method 8270
Molecular FormulaC12H8Cl6O

Link to the National Library of Medicine's Hazardous Substances
Database for more details on this compound.

Use Broad spectrum insecticide used until 1974; EPA restricted its use to termite control by direct soil injection and non-food seed and plant treatment. Wool processing industry Dieldrin was used in tropical countries as a residual spray on the inside walls and ceilings of homes for the control of vectors of diseases, mainly malaria. /Dieldrin is used to control locusts and tropical disease vectors, such as Glossina species. Industrial uses include timber preservation, termite-proofing of plastic and rubber coverings of electrical and telecommunication cables, of plywood and building boards and as a termite barrier in building construction. Contact, stomach poison in certain crops. Control of public health insect pests, termites, locusts, and tropical disease vectors.
Consumption Patterns From 1966-1970, amt of dieldrin used in the US declined from 1 million lb to approx 670,000 lb.
Apparent Color COLORLESS CRYSTALS ; Pale, tan flakes ; White, crystalline substance
Odor Mild chemical odor
Melting Point 175-176 DEG C
Molecular Weight 380.93
Density 1.75
Odor Threshold Concentration 0.041 ppm
Environmental Impact Dieldrin has been used extensively in the past as an insecticide for corn and for termite control, although it is no longer registered for general use. Dieldrin is extremely persistent, but it is known to slowly photorearrange to photodieldrin (water half-life - 4 months). Dieldrin released to soil will persist for long periods (> 7 yr), will reach the air either through slow evaporation or adsorbtion on dust particles, will not leach, and will reach surface water with surface runoff. Once dieldrin reaches surface waters it will adsorb strongly to sediments, bioconcentrate in fish and slowly photodegrade. Biodegradation and hydrolysis are unimportant fate processes. Fate of dieldrin in the atmosphere is unknown but monitoring data have demonstrated that it can be carried long distances. Monitoring data demonstrates that dieldrin continues to be a contaminant in air, water, sediment, soil, fish, and other aquatic organisms, wildlife, foods, and humans. Human exposure appears to come mostly from food.
Environmental Fate . SORPTION ISOTHERMS OF DIELDRIN ON SEVERAL FRACTIONS OF ESTUARINE SEDIMENT DETERMINED @ SEVERAL SALINITIES. ORG MATTER CONTENT MAJOR FACTOR DETERMINING SORPTION COEFFICIENT. EFFECT OF SORPTION ON LETHALITY STUDIED. TERRESTRIAL: Dieldrin released to soils will persist for extremely long periods of time (>7 yr). Its low water solubility and strong adsorption to soil makes leaching unlikely. Small amounts may volatilize from soil or be carried on dust particles into the air. Soil runoff will carry particle-associated dieldrin to water systems . AQUATIC: Dieldrin released to water systems will not undergo hydrolysis or biodegrade. It will photorearrange to photodieldrin with a half-life of approximately 4 months, or somewhat faster in waters containing photosensitizers. Adsorption to sediments and bioconcentration in aquatic organisms are likely to be important aquatic processes. Evaporation from water may be an important process, but conflicting data are available (half-life of hr to months). In a modeling study of a reservoir, it was concluded that 40% of the inflow was lost to the bottom via sedimentation, 50% released through the outflow because of the short detention time, and 10% will go to fish because of the high biomass concentration . At low flow conditions, the sediment will become a net source of dieldrin . ATMOSPHERIC: Little is known about the fate of dieldrin in the atmosphere. Because of its low vapor pressure and high Koc, dieldrin is probably associated with particulate matter. Vapor phase photodegradation has been noted but its rate has not been reported.
Drinking Water Impact DRINKING WATER: Hawaii 0.3 parts/trillion avg, 1970-71, Virgin Islands 0.19 ppb in 50% of cistern waters ; New Orleans - 3 plants 0.05-0.07 ppb . Rural counties, SC 37% pos, 0-153 parts/trillion, 55 parts/trillion mean(9). GROUNDWATER: Nebraska, 1978 below detection limit (5 parts/trillion) . NJ 1977-79 604 samples - trace (0.1 ppb)-90th percentile, highest value 0.9 ppb . SURFACE WATER: US rivers and lakes 0-0.1 ppb 1960's-1972 . Dutch rivers 1967-1977 0.02-0.06 ppb max values, not detectable in last 2 yr . NJ 1977-79 (604 samples) trace (0.1 ppb)-90th percentile . Ontario 11 agricultural watersheds 1.6-1.7 parts/trillion overall mean 1975-77(6). South Florida 1968-72 367 samples 11% pos(7). RAINWATER: Lake Erie 2.6 parts/trillion 7 samples 1976-77(8) 5-42 parts/trillion avg . EFFL: Municipal effluent 0.004-0.052 ppb . Foundries water effluent 5 ppb, textile mills 50 samples, 1 pos 0.2 ppb .

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