Chemical Fact Sheet

Chemical Abstract Number (CAS #) 2008415
CASRN 2008-41-5
Carbamothioic acid, bis(2-methylpropyl)-, S-ethyl ester
S-Ethyl diisobutylthiocarbamate
Analytical Method EPA Method 634
Molecular FormulaC11H23NOS

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

Use A SELECTIVE HERBICIDE WELL TOLERATED BY CORN. EFFECTIVE AGAINST ANNUAL GRASS WEED SPECIES SUCH AS BARNYARD GRASS CRABGRASS FOXTAILS & GOOSEGRASS IT IS ALSO EFFECTIVE AGAINST NUTSEDGES BERMUDAGRASS SEEDLINGS & JOHNSONGRASS SEEDLINGS . Control of annual grass weeds in maize, by pre-plant soil incorporation. Some broad-leaved weeds will also be controlled. Butylate is a selective herbicide which will provide effective preemergence control of perennials from seed such as quackgrass . Broadleaf weeds such as lambsquarters, redroot pigweed, purslane, annual morningglory, Florida purslane, and velvetleaf will be controlled if application is made when conditions are favorable for germination.
Apparent Color Clear liquid; Amber liquid
Boiling Point 138 DEG C @ 21.5 MM HG
Molecular Weight 217.41
Density 0.9402 @ 25 DEG C/25 DEG C
Environmental Impact Sutan's use as a herbicide releases the compound directly to the environment through applications in emulsifiable formulations, sprays or other routes of application. If released to the atmosphere, sutan will degrade rapidly in the vapor phase by reaction with photochemically produced hydroxyl radicals (half-life of about 12 hr). Its detection in rainwater samples indicates that physical removal from air via wet deposition can occur. If released to soil, sutan will dissipate primarily through microbial degradation and volatilization. Immediate soil incorporation can dramatically reduce volatilization. Soils previously exposed to sutan usually degrade it faster than soils having no prior exposure due to microbial acclimation. Sutan has low to medium mobility in soil. Various persistence studies indicate that sutan can have a soil half-life ranging from about one to five weeks. Occupational exposure to sutan occurs through dermal contact and inhalation of sprays, especially to workers applying the compound as a herbicide.
Environmental Fate TERRESTRIAL FATE: BUTYLATE DEGRADES TO SULFOXIDE IN SOIL. Duration of residual activity in soil is about 4 months. TERRESTRIAL FATE: The important dissipation processes for sutan in soil are biodegradation and surface volatilization. Microbial breakdown plays an important role in the degradation of sutan in soil(1,4). Various field and laboratory studies have demonstrated that sutan degrades more rapidly in soils previously exposed to sutan(2-3) indicating that microbial acclimation can enhance soil dissipation. In one microagroecosystem study , delaying soil incorporation of sutan (applied as an emsulifiable concentrate) for 24 hrs resulted in a 65% loss by volatilization ; immediate soil incorporation dramatically reduces surface vaporization . Soil Koc values of 185-400(6-7) indicate medium soil mobility, although the results of a field study(8) suggest low mobility. TERRESTRIAL FATE: The US Dept of Agric's Pesticide Properties Database lists a soil half-life of 13 days for sutan . The soil half-lives under crop growing conditions has been reported to range from 1.5 to 3 weeks . In a microagroecosystem study, soil incorporated sutan (emulsifiable concentrate) had an initial dissipation half-life of about 10 days with an 80% dissipation rate after 55 days ; when applied in a microencapsulated form, 44% dissipated after 55 days . In an Italian field study using a silt loam and a clay loam soil, half-lives of 11-12 days were observed in the 0-10 cm soil layer while half-lives of 31-36 days were observed in the 20-30 cm soil layer . Sutan half-lives of approximately 8-28 days were observed in various laboratory and field studies ; degradation rates were faster in soils previously treated with sutan or other thiocarbamate herbicides . In a field study using a soil previously exposed to sutan, the initial soil degradation half-life was approximately 10 days(6). AQUATIC FATE: Since microbial degradation plays an important role in sutan's degradation in soil(1-2), it may be important in natural waters having high microbial content. In contrast to soil volatilization, volatilization from water may not be very important; the volatilization half-life from a model environmental pond (2 meters deep) can be estimated to be about 71 days(3,SRC). ATMOSPHERIC FATE: Based upon a reported vapor pressure of 1.3X10-3 mm Hg at 20 deg C , sutan will exist primarily in the vapor phase in the ambient atmosphere(2,SRC). It will degrade rapidly in the vapor phase by reaction with photochemically produced hydroxyl radicals with an estimated half-life of about 12 hr(3,SRC). Particulate phase sutan and aerosols released to air during applications of sutan herbicide will be removed from air physically by dry and wet deposition. Sutan's detection in rainwater samples indicates that wet deposition occurs in the environment.
Drinking Water Impact GROUNDWATER: Sutan was not detected in 216 samples of Oregon well water; 20% of wells sampled in Wisconsin tested positive for Sutan with a maximum reported concn of 4.9 ug/l (detection limit 0.2-0.01 ug/l) ; 21% of 56 wells sampled in the vicinity of an agrichemical dealer facility in Illinois - facility wells - 28 ug/l max, 11.3 ug/l mean; not detected in neighboring wells . It has also been detected, not quantified in groundwater and water supplies in Iowa, Texas, and Georgia . In the early 1980's, 1174 community wells and 617 private wells were sampled in Wisconsin; sutan was detected, not quantified in one well . Of the 73 wells sampled in Nebraska during the mid 1970's through the late 1980's, sutan was not detected (detection limit 0.01-0.05 ppb . GROUNDWATER: Sutan was detected at a concn between 0.1-1.0 ug/l in 1 of 237 wells, contaminated as a result of a spill, sampled in Ontario, Canada between 1969 and 1978 ; detected (detection limit 1.0 ug/l) in 1 of 359 wells between 1979 and 1984 which were contaminated as a result of a spill ; detected in wells from 4 of 91 farms (detection limit 1.0 ug/l in November and December 1984 in Southern Ontario, Canada . Sutan was not detected (detection limit <10 ppb) in new drinking water wells sunk in the province of Bergamo, Northern Italy . SURFACE WATER: Sutan was reported to be present (not quantified) in the Lake Erie ecosystem - Cuyahoga River, Sadusky River, Maumee River, and the River Raisin . Sutan concn in 7 Lake Erie tributaries draining agricultural watersheds monitored from April 1983 to December 1991 (detection limit 0.05 ug/l) ranged from 0.24-5.73 ug/l . Sutan was not detected (detection limit 0.5 part/trillion) in Adige River water, Northern Italy . RAIN/SNOW: Rainfall in Iowa was sampled from October 1987 through September 1990 from the Big Spring Basin, Iowa City, and the Bluegrass watershed . Sutan was detected (detection limit 0.10 ug/l) in 2 of 235 samples at a mean concn of 0.12 ug/l (sites not specified) .

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