SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 2164172
CASRN 2164-17-2
SynonymsFluometuron
Urea, N,N-dimethyl-N'-[3-(trifluoromethyl)phenyl]
Analytical Method EPA Method 632
Molecular FormulaC10H11F3N2O

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

Use MOST ANNUAL GRASS & BROADLEAF WEEDS ARE CONTROLLED WITH NO GEOGRAPHICAL LIMITATIONS. REGISTERED FOR USE ON COTTON & SUGARCANE BY EPA. IT CONTROLS MONOCOTYLEDONOUS & DICOTYLEDONOUS WEEDS & CAN BE APPLIED BEFORE PLANTING, AFTER PLANTING, OR AFTER EMERGENCE OF CROP & WEEDS. CROP PLANTS THAT MAY BE SENSITIVE: SUGAR BEETS, RED BEETS, COLE CROPS, CUCURBITS, & EGGPLANTS. FLUOMETURON IS ESPECIALLY SUITABLE FOR CONTROL OF ANNUAL BROAD-LEAVED AND GRASS WEEDS OF COTTON AT 1.6-2.7 KG ACTIVE INGREDIENT/HECTARE; ALSO AS PRE- AND POST-EMERGENCE SPRAYS ON SUGAR CANE, PINEAPPLE AND COFFEE AT RATES OF 3-4 LB ACTIVE INGREDIENT/ACRE. HERBICIDAL PROPERTIES ARE SHARED BY THE 4-TRIFLUOROMETHYL DERIVATIVE BUT NOT BY N'3,5-BIS(TRIFLUOROMETHYL)PHENYL-N,N-DIMETHYLUREA.
Consumption Patterns 100% AS AN HERBICIDE ON COTTON (1975)
Apparent Color WHITE CRYSTALS; Colorless crystals
Odor ODORLESS
Melting Point 163-164.5 DEG C
Molecular Weight 232.21
Density 1.39 g/cu cm (20 deg C)
Sensitivity Data DUST MAY BE IRRITATING TO THE EYE .
Environmental Impact Fluometuron is a herbicide used primarily for the control of broadleaf weed and grass in cotton fields. The release of fluometuron in the environment occurs during its manufacture and particularly from its use in the field. In soil, fluometuron is transformed in the environment primarily by biodegradation. The half-life of fluometuron disappearance from soil is about 85 days. Fluometuron is highly to moderately mobile in soil. Both biodegradation and photolysis are expected to be the major pathways for the loss of fluometuron in water. The bioconcentration of fluometuron in aquatic organisms should not be important. Reaction of vapor phase fluometuron with photochemically produced hydroxyl radicals may be an important fate process in the atmosphere (estimated half-life 4.1 hrs). Removal of fluometuron can also occur as a result of dry and wet deposition. Fluometuron has rarely been detected in surface water, groundwater or food in the US. The applicators of the herbicide and farm workers are the most likely people for exposure to fluometuron by inhalation and dermal routes.
Environmental Fate TERRESTRIAL FATE: IT IS OF INTERMEDIATE PERSISTENCE WITH A HALF-LIFE OF 60-75 DAYS ACCORDING TO SOIL CONDITIONS. TERRESTRIAL FATE: AVG LOSS OF FLUOMETURON ATTRIBUTED TO RUNOFF WAS LESS THAN 1% OF THE TOTAL APPLIED. FLUOMETURON IS LEACHED TO A MODERATE EXTENT IN SOIL. IT HAS A LEACHING INDEX OF 12 WHERE 1 IS VERY SLIGHT & 20 IS VERY GREAT. THIS MODERATE LEACHING FACTOR IS IMPORTANT FOR CONTROL OF DEEP GERMINATING WEEDS. Terrestrial Fate: Fluometuron decreased from 6 ppm to < 0.5 ppm in approximately 165 days in the 0 to 5 cm layer of a plant-free Swiss clay loam under field conditions. Soil compostion: 18% clay, 12% silt, 67% sand, < 1% humus; pH 5.7. Herbicide applied at the rate of 4 kg active ingredient/ha. From figure TERRESTRIAL FATE: Biodegradation will be the major process by which fluometuron will be lost from most soils . Some loss of fluometuron from soil surface will occur as a result of photolysis by sunlight . Based on hydrolysis in water, hydrolysis of fluometuron in soil may not be important(3,SRC). Both soil thin layer chromatographic and soil leaching studies indicate that the leaching of fluometuron in soil is very high to medium(2,7). Volatilization is not expected to contribute significantly to dissipation of fluometuron in the field . Depending on the nature of soil and climatic conditions, the field half-life of fluometuron in soil ranged from 10-171 days(1,3-6) with an average half-life of 85 days . AQUATIC FATE: Based on the observed biodegradation in soil , biodegradation of fluometuron may be important in water. The fast photolysis of fluometuron in water by natural sunlight indicates that photolysis may be an important process in surface of natural water. The importance of photolysis will decrease due to light attenuation in turbid water and with increase in water depth. The hydrolysis of fluometuron in water will not be important . Based on an estimated value of 1.45X10-9 atm-cu m/mole for the Henry's Law constant, the rate of volatilization of fluometuron from water will be negligibly small(4,SRC). The estimated BCF values in the range of 28-45 indicates that bioconcentration of fluometuron in aquatic organisms will not be important. ATMOSPHERIC FATE: A vapor pressure of 5.0X10-7 mm Hg at 20 deg C indicates that fluometuron may be present partially in the vapor phase and partially in the particulate form in air(2,SRC). Based on an estimation method , gas-phase fluometuron will be removed from the atmosphere with an estimated half-life of 4.1 hrs due to reaction with photochemically produced hydroxyl radicals. Since fluometuron in water photolyzed with a half-life of 1.2 days with natural sunlight , direct photolysis of fluometuron in air may also be important. Partial removal of particulate fluometuron from the air may occur by dry deposition. The water solubility of 105 mg/l at 20 deg C indicates that both vapor and particle phase fluometuron may be partly removed from the atmosphere by wet deposition as well.
Drinking Water Impact According to the record maintained in the STORET database of EPA, fluometuron was not detected in 14 surface water samples from 14 locations nor in any of the 156 groundwater samples analyzed from 125 locations in the U.S. . At a detection limit of 0.5 ug/l, no fluometuron was detected in water from 119 wells, springs and municipal drinking water supplies throughout Arkansas during 1985-1987 .

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