SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 1031078
CASRN 1031-07-8
SynonymsEndosulfan sulfate
6,9-Methano-2,3,4-benzodioxathiepin, 6,7
Analytical Methods EPA Method 508
EPA Method 608
EPA Method 617
EPA Method 625
EPA Method 8081
EPA Method 8270
Molecular FormulaC9H6Cl6O4S

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

Use SRP: Not commercially produced. Endosulfan is its precursor.
Melting Point 181 DEG C
Molecular Weight 422.95
Environmental Impact Endosulfan sulfate will be found in the environment as a result of the use of endosulfan as an insecticide. If endosulfan sulfate is released to the soil, it will be expected to bind to the soil, and will not be expected to leach to the groundwater. No information about hydrolysis in soils was found; however, this may be an important fate process based on reported hydrolysis half-lives for endosulfan isomers of 35.4-37.5 days at pH 7.0 and 150.6-187.3 days at pH 5.5. Biodegradation may be an important fate process with a half-life of 11 weeks for endosulfan sulfate incubated with mixed cultures from a sandy loam soil. If endosulfan sulfate is released to water, it will be expected to adsorb to the sediment and may bioconcentrate in aquatic organisms. Photolysis may not be an important fate process based on the stability of thin films of endosulfan sulfate exposed to light >300 nm. Endosulfan sulfate was not degraded in standard screening tests using settled domestic wastewater as inoculum. However, endosulfan sulfate has been reported to be biodegraded when exposed to mixed cultures from a sandy loam soil. Hydrolysis in water may be an important fate process based on reported hydrolsyis half-lives for endosulfan isomers of 35.4-37.5 days at pH 7.0 and 150.6-187.3 days at pH 5.5. Evaporation from water may be an important transport process based on an estimated half-life of 43 hr for evaporation from a river 1 m deep, flowing 1 m/sec with a wind velocity of 3 m/sec. Evaporation from lakes and deeper streams and rivers will be slower and adsorption to sediments will slow evaporation. If released to the atmosphere, it will react with hydroxyl radicals with a resulting estimated vapor phase half-life in the atmosphere of 1.23 hr. Photolysis may not be an important fate process based on the stability of thin films of endosulfan sulfate to light >300 nm. Exposure to endosulfan sulfate will result from the ingestion of contaminated food.
Environmental Fate Aquatic Fate: Terminal residues found in aquatic ecosystems include endosulfan sulfate. Endosulfan sulfate is the major product expected under aerobic conditions in slightly acidic waters. Oxidation is slow under anaerobic conditions. Aquatic Fate: In aquatic, environments (water and sediment), endosulfan diol was present along with smaller amounts of the sulfate. TERRESTRIAL FATE: If endosulfan sulfate is released to the soil, it will be expected to bind to the soil based on estimated Koc values, and will not be expected to leach to the groundwater. No information about hydrolysis in soils was found; this may be an important fate process based on reported hydrolysis half-lives for endosulfan isomers of 35.4-37.5 days at pH 7.0 and 150.6-187.3 days at pH 5.5 . Biodegradation may be an important fate process with a half-life of 11 weeks reported when endosulfan sulfate is incubated with mixed cultures from a sandy loam soil, and endosulfan sulfate has been reported to occur in the metabolic pathway of endosulfan exposed to mixed cultures from a sandy loam soil(2,SRC). AQUATIC FATE: Little information about the fate of endosulfan sulfate in water was found. If endosulfan sulfate is released to water, it will be expected to adsorb to the sediment and may bioconcentrate in aquatic organisms. Photolysis may not be an important fate process based on the stability of thin films of endosulfan sulfate to light >300 nm. Biodegradation may not be an important fate process since endosulfan sulfate was not degraded in standard screening tests using settled domestic wastewater as inoculum. However, endosulfan sulfate has been reported to occur in the metabolic pathway of endosulfan exposed to mixed cultures from a sandy loam soil. No information about hydrolysis in water was found; this may be an important fate process based on reported hydrolysis half-lives for endosulfan isomers of 35.4-37.5 days at pH 7.0 and 150.6-187.3 days at pH 5.5. Evaporation from water may be an important transport process based on an estimated half-life of 43 hr for evaporation from a river 1 m deep, flowing at 1 m/sec with a wind velocity of 3 m/sec. Evaporation from lakes and deeper streams and rivers will be slower and adsorption to sediments will slow evaporation processes. ATMOSPHERIC FATE: If released to the atmosphere, endosulfan sulfate will react with hydroxyl radicals with a resulting estimated vapor phase half-life in the atmosphere of 1.23 hr . Photolysis may not be an important fate process based on the stability of thin films of endosulfan sulfate to light >300 nm . TERRESTRIAL FATE: IN A CONTROLLED ENVIRONMENT, LOSSES FROM GLASS & PLANT SURFACES WERE IN THE DECREASING ORDER ENDOSULFAN ETHER, ENDOSULFAN I, ENDOSULFAN II, ENDOSULFAN SULFATE, ENDOSULFANDIOL. IN THE GREENHOUSE, HOWEVER, UNDER SEMICONTROLLED CONDITIONS, THE SEQUENCE OF LOSS FROM PLANT SURFACES WAS, IN DECREASING ORDER, ENDOSULFAN I, ENDOSULFAN ETHER, ENDOSULFAN II, ENDOSULFANDIOL, ENDOSULFAN SULFATE.
Drinking Water Impact Residues found in the Brantas River system, and Madura Sea, and the canals and ponds in the Brantas River system for endouslfan sulfate collected during March, where a major portion of the spraying was also carried out during this period (ie rainy season, January-April (range) were: Canals <0.01 - 0.55 ug/l; Fish ponds: <0.01-0.44 ug/l; River system 0.1-0.45 ug/l; Madura Sea: <0.01-0.28 ug/l. No endosulfan sulfate residues were detected (method sensitivity 10 ug/l) in well waters located near treated fields in Wisconsin and Florida 282 and 100 days respectively, after the last endosulfan application. SURFACE WATER: USEPA STORET database, 850 samples, 0% pos . EFFL: USEPA STORET database, 605 samples, 1.6% pos, median <0.020 ppb . National US Urban Runoff Program, through July, 31, 1982, 15 cities, 0% pos .

DISCLAIMER - Please Read

Florida-Spectrum List of Services
Florida-Spectrum Homepage