Chemical Fact Sheet

Chemical Abstract Number (CAS #) 298022
CASRN 298-02-2
Phosphorodithioic acid, O,O-diethyl S-[(ethylthio) methyl] ester
Analytical Method EPA Method 8141
Molecular FormulaC7H17O2PS3

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

Use Application sites: Non-domestic terrestrial and aquatic food/feed crops, and greenhouse commercial nursery stock (both outdoor and greenhouse). PHORATE IS USED TO PROTECT PRIMARILY BRASSICAS, COFFEE, COTTON, FIELD AND ROOT CROPS, FROM SUCKING & BITING INSECTS, MITES & CERTAIN NEMATODES. ALSO USED IN MAIZE AND SUGAR BEET AGAINST SOIL-DWELLING PESTS. Phorate is a systemic and contact insecticide and acaricide. It is used primarily to protect crops, especially root and feed crops, cotton, brassicas, and coffee from sucking and biting insects, mites, and certain nematodes Phorate is also used as a soil insecticide on corn and sugar beets. A food additive permitted in the feed and drinking water of animals and/or for the treatment of food-producing animals. /Insecticide in beetroot, fodder beet, carrots, field beans, broad beans, celery, potatoes, tomatoes, hops, sunflowers, lucerne, rice, groundnuts, and some ornamentals. Wide range of insects on a variety of crops: alfalfa, barley, beans, corn, cotton, peanuts, potatoes, sorghum, sugar beets, soybeans, sugarcane, and wheat.
Consumption Patterns 64% FOR CORN; 13% FOR FIELD CROPS; 13% FOR GRAINS; 10% FOR OTHER CROPS (1971) Applied to barley, 4.4%; corn, 8.9%; cotton, 47.6%; sorghum, 3%; sugarbeets, 13.1%; wheat, 22.7%; remainder is used on alfalfa, beans, ornamentals, structures (1984) California use IN 1971, 4.2 MILLION POUNDS OF PHORATE USED IN UNITED STATES REPRESENTED2% OF TOTAL INSECTICIDE USED THAT YEAR. USE GROWING STEADILY, WITH INDICATIONS OF FURTHER INCR . (1974) 3.50X10 9 GRAMS (CONSUMPTION) (1984) 5.90X10 8 g California use
Apparent Color CLEAR LIQUID ; Yellowish liquid ; Pale straw to light brown; colorless to very light yellow liquid
Odor Skunk-like odor
Boiling Point 125-127 DEG C @ 2 MM HG
Melting Point -42.9 DEG C
Molecular Weight 260.40
Density 1.156 @ 25 DEG C/4 DEG C
Environmental Fate Terrestrial Fate: A field expt was conducted to study the behavior of phorate in soil under subtropical conditions. Phorate granules (10%) were applied to silt loam soil at the rate of 40 kg active ingredient/ha and incorporated to a 10-cm depth. Phorate was rapidly oxidized to its sulfoxide and sulfone. Phorate sulfoxide and sulfone were relatively more persistent than phorate itself. Terrestrial Fate: A study was conducted to investigate the persistence of selected insecticides after seasonal (spring and fall) applications to silt loam soil over a 4 yr period. Phorate was applied at 10 kg/ha. Insecticide residues were monitored in the top 15 cm of soil each spring and fall before application. Insecticide residues accumulated after fall applications but degraded rapidly after spring applications. Phorate did not accumulate from 1 yr to the next, and its residues represented less than 0.2% of cmpd applied after 5 yr. Terrestrial Fate: Phorate has some potential to leach through soil and contaminate groundwater, particularly where soils are sandy and aquifers are shallow. Terrestrial Fate: Phorate and carbofuran applied at a 1 kg/ha in a field trial against Hydronomidius molitor (rice root weevil) had degraded after 4 and 3 months, respectively, in flooded soil. In rice plants, strong decreases in the content of these insecticides was found 3 wk after application. At the time of harvest, the rice plants did not contain any insecticide.

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