SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 957517
CASRN 957-51-7
SynonymsDiphenamid
Benzeneacetamide, N,N-dimethyl-.alpha.-phenyl-
Dymid
N,N-Dimethyldiphenylacetamide
Enide
Rideon
Diherbid
Analytical Method EPA Method 645
Molecular FormulaC16H17NO

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

Use HERBICIDE FOR CONTROL OF ANNUAL BROADLEAF WEEDS & ANNUAL GRASSES. SELECTIVE PREEMERGENCE HERBICIDE THAT CONTROLS GRASSES & BROADLEAF WEEDS SUCH AS CARPETWEED, CHICKWEED, KNOTWEED, LAMBSQUARTERS, PIGWEED, PURSLANE, & SMARTWEED. Control of annual grasses and some broad-leaved weeds in cotton, potatoes, sweetpotatoes, tomatoes, vegetables, capsicums, okra, soya beans, groundnuts, tobacco, pome fruit, stone fruit, citrus fruit, bush fruit, strawberries, forestry nurseries, and ornamental plants, shrubs, and trees. Plant growth regulator
Consumption Patterns HERBICIDE, OF WHICH APPROXIMATELY 52% IS USED ON FIELD CROPS AND 48% ON VEGETABLE CROPS (1975)
Apparent Color WHITE ; CRYSTALS FROM ETHYL ACETATE ; WHITE PRISMS ; Colorless
Odor NO APPRECIABLE ODOR
Melting Point 134.5 TO 135.5 DEG C
Molecular Weight 239.34
Density 1.17 @ 23.3 DEG C
Environmental Impact Diphenamid will be released in the environment during it use as a herbicide. If released to soil, the loss of diphenamid will occur primarily due to biodegradation. Loss of diphenamid from soil due to volatilization and photolysis should not be important. Diphenamid is expected to have a moderate mobility in soils. Depending on soil characteristics and rainfall, the persistence of diphenamid in soil may be 3-8 months. If released to water, the major process for the loss of diphenamid is probably biodegradation. Hydrolysis, photolysis, bioconcentration, and volatilization should not be important processes in water. Diphenamid will be found completely adsorbed to particulate matter in the atmosphere and may be removed by dry and wet deposition. Partial removal of diphenamid will also occur as a result of dry and wet deposition. The applicators of the herbicide and farm workers are the most likely people for exposure to diphenamid by inhalation and dermal routes.
Environmental Fate TERRESTRIAL FATE: Diphenamid has an estimated Koc of 210 and therefore would be expected to leach moderately in soil. Biodegradation is the primary degradative pathway for loss of diphenamid from soils(1-2). The persistence of diphenamid in soil will depend on the soil type, moisture content and the temperature of soil . Under warm, moist conditions, the average persistence of diphenamid after application at recommended rates is 3-6 months . At higher application rates and under low rainfall or colder temperatures, diphenamid may persist in soil longer than 6 months(5-6). The rate of biodegradation increases moderately in soils that have been previously treated with diphenamid. Diphenamid is non volatile and appears to be stable in sunlight . AQUATIC FATE: Neither hydrolysis(1-2) nor photolysis by sunlight(3-4) should be important for the degradation of diphenamid in water. Based on its ability to undergo biodegradation in soil , biodegradation should be the most important process for diphenamid in water. A Koc value of 210(6) indicates that diphenamid may be moderately adsorbed to suspended solids and sediment in water. The estimated BCF value of 27(6) indicates that bioconcentration of diphenamid in aquatic organisms will not be important. ATMOSPHERIC FATE: Based on a vapor pressure of 3X10-8 mm Hg , diphenamid should be present mostly in the particulate form in air, but a small amount may be present in the vapor phase(2,SRC). Based on an estimation method , vapor phase diphenamid may be removed from the atmosphere with a half-life of 10.6 hrs due to reaction with photochemically produced hydroxyl radicals. Partial removal of particulate diphenamid from the air may occur by dry deposition. Both vapor and particle phase diphenamid may be partly removed from the atmosphere by wet deposition.
Drinking Water Impact GROUNDWATER: Diphenamid was not found in 678 ground water samples taken from 676 locations . It was detected at a concn 6000 ug/l in a groundwater sample from CA . Diphenamid was also detected at a concn 43 ug/l in ground waters under a suspected spill site in a rural area in Ontario,Canada .

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