Chemical Fact Sheet

Chemical Abstract Number (CAS #) 72208
CASRN 72-20-8
1,4:5,8-Dimethanonaphthalene, 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-endo,endo-
Compound 269
Analytical Methods EPA Method 505
EPA Method 508
EPA Method 525.2
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 IT IS A NON-SYSTEMIC & PERSISTENT INSECTICIDE USED MAINLY ON FIELD CROPS. IT IS NON-PHYTOTOXIC @ INSECTICIDAL CONCN, BUT IS SUSPECTED OF /CAUSING DAMAGE TO MAIZE. SRP: FORMER USE Insecticide used to control the army cutworm (Euxoa aoxiliaris), the pale western cutworm (Agrotis orthogonia), pine vole (Microtus pinetorium), meadow voles (Microtus species), and grasshoppers, but only when federal regulations are strictly followed. SRP: Former use INSECTICIDE FOR SMALL GRAINS, SUGARCANE, & APPLE ORCHARDS SRP: FORMER USE The only known use of endrin is as an insecticide, as an avicide, and as a rodenticide. Former use Endrin has been used mainly on field crops such as cotton and grains. It has also been used for grasshoppers in noncropland and to control voles and mice in orchards. SRP: Former use Control of a wide range of insects (particularly Lepidoptera) in cotton, maize, sugarcane, rice, cereals, ornamentals, and other crops. SRP: Former use
Odor Odorless
Melting Point BELOW 392 DEG F
Molecular Weight 380.93
Density Specific gravity 1.7 @ 20 deg C.
Odor Threshold Concentration 1.80x10-2 ppm (perfume/flavor grade purity).
Environmental Impact Endrin has been formely used as an insecticide on cotton (its major use) and grains, and as an avicide, and rodenticide. EPA presently considers the pesticide cancelled. Endrin is very persistent, but it is known to photodegrade to delta-ketoendrin (half-life 7 days - June). Endrin released to soil will persist for long periods (up to 14 yrs or more), will reach the air either through very slow evaporation or adsorption on dust particles, will not leach to groundwater, and will reach surface water with surface runoff. Once endrin reaches surface waters it will adsorb strongly to sediments, bioconcentrate in fish, and photodegrade. Biodegradation will not be an important process. Fate of endrin in the atmosphere is unknown, but it probably will be primarily associated with particulate matter and be removed mainly by rainout and dry deposition. Monitoring data demonstrates that endrin continues to be a contaminant in air, water, sediment, soil, fish, and other aquatic organisms. Human exposure appears to come mostly from food or occupational exposure.
Environmental Fate TERRESTRIAL FATE: Endrin released to soils will persist for extremely long periods of time (up to 14 yr or more). Biodegradation may be enhanced somewhat in flooded soils or under anaerobic conditions. Its low water solubility and strong adsorption to soil makes leaching into groundwater unlikely; However, the detection of endrin in certain groundwater samples suggest that leaching may be possible in some soils. Small amounts may volatilize from soil or be carried by dust particles into the air. Runoff from rain or irrigation of particle-associated endrin will carry particle-associated endrin to water systems(1,SRC). AQUATIC FATE: Endrin released to water systems will not hydrolyze or biodegrade. It will be subject to photoisomerization to ketoendrin. It will extensively sorb to sediment and will significantly bioconcentrate in aquatic organisms. Evaporation from water will not be significant based on a calculated Henry's law constant of 4X10-7 atm cu m/mol(1,SRC). ATMOSPHERIC FATE: Little is known about the fate of endrin in the atmosphere. Because of its low vapor pressure and high Koc, endrin is probably associated with particulate matter. It will likely be subject to photoisomerization to ketoendrin. A half-life of 1.45 hrs has been predicted for reaction with hydroxyl radicals(1,SRC).
Drinking Water Impact DRINKING WATER: Endrin has been detected in 3 New Orleans, LA finished drinking waters at 4-8 parts/trillion and in Ottawa, Canada tap water at <13 parts/trillion . Drinking water from Franklin, LA - 1961-62 (area of high endrin use) contained a maximum of 23 parts/trillion . GROUNDWATER: New Jersey, 1977-79, detected in 114 of 1076 samples - max 0.2 ppb . Detected, not quantified in 1 or more of 54 wells in California and 1 or more of 40 wells in New Jersey . SURFACE WATER: Major river basins, US 1957-65, 732 samples, 38% pos, 7-149 parts/trillion ; New Jersey, 1977-79, 604 samples, 18% pos, 0.5 ppb max(11). US, 1964-68, 529 samples, 13% pos, 0.086-0.133 ppb . Western US streams, 1968-71, detected in 1 of 20 sited,0.01-0.03 ppb ; 1967-68, 333 samples from 20 stations, 1% pos, 0.01-0.07 ppb ; 1965, 114 samples, 6% pos, 5-40 parts/trillion . Major US streams, 96 stations, 0.094 ppb max(6). Habitant Creek, Nova Scotia, Canada farm area, fall, 1972 - not detected to 18.46 ppb, median - 0.04 ppb(7). Tule Lake, CA - April, 1965-Feb 1967, 44 samples, 41% pos, .7-100 parts/trillion(8). Northeast LA, 1 of 3 lakes, 6 parts/trillion ave(9); Bayou Yokely, LA, fall, 1964 - not detected to 530 parts/trillion, 130 parts/trillion avg(10). SEAWATER: Dutch estuarian mixing area, June 1974, 5 to 60 ppt, Dec 1974, 2 to 8 ppt; Dutch coastal waters, June 1979, <0.01 to 0.3 parts/trillion . Galveston Bay, TX, fall 1964, not detected . RAIN WATER: 12 locations across Canada, April 1977 - Dec 1980, 210 samples, 44% pos detection limit (>1 parts/trillion, detection limit = .001 ppb), 10 ppb max . EFFL: Not detected in 51 catchments of runoff in 19 cities, 1977-82 . Industrial raw wastewater, 148 samples, 6% pos, 8 quantitative results ranged 5 to 10 ppb .

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