SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 56724
CASRN 56-72-4
SynonymsCoumaphos
Coumarin, 3-chloro-7-hydroxy-4-methyl-, O-ester with O,O-diethylpyrophosphorothioate
Co-Ral
Phosphorothioic acid, O-(3-chloro-4-methyl-2-oxo-2H-1-benzopyran-7-yl) O,O-diethyl ester
Analytical Method EPA Method 8141
Molecular FormulaC14H16ClO5PS

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

Use Medication (Vet): Anthelmintic MEDICATION (VET): Treatment of screwworms, maggots, ear ticks on livestock FEED ADDITIVE FOR CATTLE & POULTRY, TO CONTROL LARVAE OF FECAL BREEDING FLIES; AS DUST, DIP, OR SPRAY FOR CONTROL OF MANGE, HORN FLIES, & FACE FLIES OF CATTLE; HAS ALSO BEEN INCORPORATED IN WOUND TREATMENT POWDERS. INSECTICIDE FOR CATTLE GRUBS, LICE, ECTOPARASITES OF SHEEP, GOATS, HORSES, SWINE, POULTRY.
Consumption Patterns 100%, OR 1.8X10 8 G AS A LIVESTOCK INSECTICIDE (FOR CATTLE GRUBS, TICKS, FLIES, LICE, ECTOPARASITES ON SHEEP, GOATS, HORSES, SWINE, POULTRY, & LIVESTOCK SCREWWORMS) (1974 EST)
Apparent Color Tan crystalline solid
Odor Slight sulfur-like odor
Melting Point 91 DEG C
Molecular Weight 362.78
Density 1.47 @ 20 deg C/4 deg C
Odor Threshold Concentration 2.0X10-2 ppm (Detection in water; purity not specified).
Sensitivity Data Irritating to skin and eyes
Environmental Impact Coumaphos is a veterinary insecticide used to control ectoparasites on livestock and poultry, fly larvae in poultry fecal material, and gastrointestinal nematodes. It may be released to the environment in wastewater, spills, and as aerosols during its production, formulation, and use in spraying or dipping livestock and poultry including disposal of dipping solutions, and cleaning vats and spray equipment. If spilled on land, coumaphos would be expected to adsorb strongly to the soil and very slowly biodegrade (half-life 200 - 300 days). If released as wastewater, coumaphos should adsorb strongly to sediment and particulate matter in the water column. It has been reported to disappear from pond water (pH 5.5) in less than 7 days although the processes contributing to this disappearance are not clear. There is a moderate potential for bioconcentration in aquatic organisms. In the atmosphere, coumaphos would most likely be in the form of an aerosol. It will be subject to gravitational settling and may photolyze. Exposure will be primarily occupational by dermal contact.
Environmental Fate TERRESTRIAL FATE: If spilled on land, coumaphos would be expected to adsorb strongly to the soil. Biodegradation would be extremely slow (half-life 200-300 days). AQUATIC FATE: If released into water, coumaphos should adsorb strongly to sediment and particulate matter in the water column. While chemical hydrolysis and biodegradation are reportedly slow, the only available study in environmental waters found that coumaphos disappeared from pond water (pH 5.5) in less than 7 days. Volatilization would not be a significant loss process. ATMOSPHERIC FATE: If released into air, coumaphos would most likely be in the form of an aerosol and be subject to gravitational settling. Photolysis may occur; however, no environmentally relevant rates are available for this process.
Drinking Water Impact Coumaphos was not detected in 82 water samples collected from 1964-1966 in New York State at a detection limit of 10 ppb .

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