SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 1861401
CASRN 1861-40-1
SynonymsBenefin
Benzenamine, N-butyl-N-ethyl-2,6-dinitro-4-(trifluoromethyl)-
Benfluralin
N-Butyl-N-ethyl-4-trifluoromethyl-2,6-trinitroaniline
Analytical Method EPA Method 627
Molecular FormulaC13H16F3N3O4

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

Use SELECTIVE PRE-EMERGENCE HERBICIDE Controls annual grasses and broadleaf weeds in seeded alfalfa, birdsfoot trefoil, ladino clover, red clover, direct-seeded lettuce, peanuts, transplant air cured (burley, dark) tobacco, established turf. Control of annual grasses and some annual broad-leaved weeds in groundnuts, cucumbers, chicory, endives, field beans, french beans, lentils, lucerne. Applied pre-emergence, with soil incorporation.
Apparent Color YELLOW-ORANGE CRYSTALLINE SOLID
Odor NO APPRECIABLE ODOR
Boiling Point 148-149 deg C @ 7 mm Hg
Melting Point 65-66.5 DEG C
Molecular Weight 335.32
Sensitivity Data Benefin may cause skin sensitization reactions in certain individuals. MAY BE IRRITATING TO SKIN & EYES.
Environmental Impact Benefin will be released in the environment during its manufacture and use as a herbicide. If released to soil, the loss of benefin should occur due to biodegradation, photolysis and volatilization. Half-lives of benefin in soil range from 0.7-4 months. Benefin is expected to have low mobility in soils. The major pathways for the loss of benefin from water may be biodegradation, photolysis and volatilization. Bioconcentration of benefin in aquatic organisms should be important. Reaction with photochemically produced hydroxyl radicals may be important for the loss of vapor phase benefin in the atmosphere. The half-life of benefin due to this reaction has been estimated to be 3.1 hrs. Partial removal of benefin will also occur as a result of dry and wet deposition. Applicators of benefin and farm workers are the most likely people for exposure to benefin by inhalation and dermal routes.
Environmental Fate WHEN SOIL TREATED WITH BENEFIN WAS FLOODED WITH WATER, BENEFIN DECOMP RAPIDLY. ONLY 4.6% WAS DETECTABLE AFTER 16 DAYS. THE MAJOR DEGRADATION PRODUCTS WERE BENEFIN WITH ONE NITRO GROUP REDUCED; WITH BOTH NITRO GROUPS REDUCED; & WITH BOTH NITRO GROUPS REDUCED PLUS REMOVAL OF BOTH ALKYL GROUPS. FIVE OTHER METABOLITES WERE DETECTED. THESE CMPD CONSTITUTED LESS THAN 5% OF THE TOTAL RADIOACTIVITY. EXTRACTABLE POLAR PRODUCTS WERE OBSERVED & BELIEVED TO BE AROMATIC AMINE CONDENSATION PRODUCTS. UNDER AEROBIC CONDITIONS, BENEFIN DEGRADATION IN SOIL WAS SLOWER. /STRUCTURAL FORMULAS OF DEGRADATION PRODUCTS GIVEN IN SOURCE BENEFIN DECOMP RAPIDLY IN SOIL UNDER DEFINED ANEROBIC CONDITIONS, WITH APPROX 5% DETECTABLE AFTER 16 DAYS. UNDER DEFINED AEROBIC CONDITIONS, 50% OF THE ORIGINALLY INCORPORATED BENEFIN WAS DETECTABLE AFTER 120 DAYS & ONLY 12.1% AFTER 352 DAYS. IDENTIFIABLE DEGRADATION PRODUCTS WERE THE DEALKYLATED, REDUCED & OXIDIZED DERIVATIVES OF BENEFIN & AN UNIDENTIFIED POLAR MIXT. Duration of residual activity in soil is about 4-8 months. TERRESTRIAL FATE: Biodegradation, volatilization and photolysis may all play significant roles for the loss of benefin from soils . A Koc value of 9000 indicates that benefin should remain strongly adsorbed in most soils and leaching of benefin from most soils should not be important(3,SRC). The persistence of benefin in soil will depend on the soil type, moisture content and the temperature of soil . The persistence of benefin under field use conditions may be close to a year . AQUATIC FATE: Based on studies in soil, photolysis by sunlight and biodegradation may be important for the degradation of benefin in water(1,SRC). Based on an estimation method and a Henry's Law constant value of 2.91X10-4 atm cu m/mole estimated from the ratio of vapor pressure and water solubility , the volatilization half-life of benefin from a model river of depth 1 m flowing at a current speed of 1 m/sec and a wind speed of 3 m/sec would be 10.8 hrs. A Koc value of 9000 indicates that benefin may be strongly adsorbed to suspended solids and sediment in water. The BCF values of 2160 and about 2000 estimated from regression equations and a log Kow value of 4.69 and a water solubility of 0.1 mg/l indicates that bioconcentration of benefin in aquatic organisms will be an important environmental process. ATMOSPHERIC FATE: Based on a measured vapor pressure of 6.6X10-5 mm Hg at 25 deg C , benefin should exist both in the particulate and in the vapor phase in air(2,SRC). Based on an estimation method(3-4), vapor phase benefin may be removed from the atmosphere with an estimated half-life of 3.1 hrs due to reaction with photochemically produced hydroxyl radicals. Partial removal of particulate benefin from the air may occur by dry deposition. Both vapor and particle phase benefin may be partly removed from the atmosphere by wet deposition.

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