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Chemical Fact Sheet

Chemical Abstract Number (CAS #) 2642719
CASRN 2642-71-9
SynonymsAzinphos ethyl
Ethyl Guthion
Phosphorodithioic acid, O,O-diethyl ester, S-ester with 3-(mercaptomethyl)-1,2,3-benzotriazin-4(3H)-one
Analytical Method EPA Method 8141
Molecular FormulaC12H16N3O3PS2

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

Use INSECTICIDE-NOT REGISTERED FOR USE IN USA Azinphos-ethyl was introduced in 1953 by Bayer AG as a nonsystemic insecticide and acaricide. Although it is no longer registered for use in many countries due to its extreme acute toxicity to humans, some countries still use azinphos-ethyl for fruits and vegetables, pastures, cotton, cereals, coffee, potatoes, grapes, citrus, tobacco, rice, hops, and other crops of the forest industry. Persistent broad spectrum insecticide effective against pests of fruits, vegetables, cotton, and ornamentals. IT IS USED ON A LARGE RANGE OF CROPS, INCLUDING BEETS, CEREALS, CITRUS, COFFEE, COTTON, FORAGE CROPS, GRAPES, HOPS, OILSEED CROPS, SOME ORNAMENTALS, POTATOES, RICE, TOBACCO, TOP FRUIT, VEGETABLES. RATES ARE GENERALLY 500-750 G AI/HA. INSECTICIDE; ACRICIDE Control of chewing and sucking insects and spider mites on fruit trees (including citrus), vines, nuts, maize and forestry. For beetles, caterpillars and their larvae, aphids, spider mites, etc
Consumption Patterns INSECTICIDE-NOT REGISTERED FOR USE IN US
Apparent Color COLORLESS CRYSTALS ; Colorless needles
Boiling Point 111 DEG C @ 0.001 MM HG
Melting Point 53 DEG C
Molecular Weight 345.40
Density 1.284 @ 20 DEG C/4 DEG C
Environmental Impact Azinphos-ethyl would be released to the environment in its use as a non-systemic insecticide and acaricide on a wide range of crops. It is not marketed in the US or Canada and consequently there should be no release of this insecticide resulting from its application. When released on soil, azinphos-ethyl will adsorb strongly to soil, hydrolyze, and probably biodegrade. Its persistence in soil is unknown. If released in water, azinphos-ethyl will adsorb to sediment and particulate matter in the soil column. It should hydrolyze, especially in alkaline waters, and possibly biodegrade. One study suggests that it persists in rice fields for less than two months. Azinphos-ethyl is not expected to bioconcentrate in fish. In the atmosphere, azinphos-ethyl will primarily occur as an aerosol and will be removed by gravitational settling. Vapor-phase azinphos-ethyl will have an atmospheric half-life of 2.2 hr due to its reaction with photochemically-produced hydroxyl radicals. People will be exposed to azinphos-ethyl from consuming food products containing residues of the pesticide. Since azinphos-ethyl is not marketed in the US, azinphos-ethyl residues should only occur in imported foodstuffs.
Environmental Fate TERRESTRIAL FATE: When released on soil, azinphos-ethyl will adsorb strongly to soil, hydrolyze, and probably biodegrade. Hydrolysis will be more important in moist, alkaline soils. However, no studies were located concerning azinphos-ethyl's persistence in soil. AQUATIC FATE: If released in water, azinphos-ethyl will adsorb to sediment and particulate matter in the water column. It should hydrolyze, especially in alkaline waters, and possibly biodegrade. A study in which azinphos-ethyl was used on rice fields in the Ebro Delta in Spain suggests that the azinphos-ethyl may persist for less than two months in this environment and does not bioconcentrate in fish . Mosquito fish living in the rice fields were sampled at two month intervals. In September, the fish contained 17 ppb of azinphos-ethyl and only 2 ppb was detected in November, indicating that azinphos-ethyl was largely removed from both the water column and fish within the two month period. ATMOSPHERIC FATE: Azinphos-ethyl has a very low vapor pressure, 2.2X10-7 mmHg at 20 deg C and therefore will primarily occur as an aerosol in the atmosphere . If released into the air while spraying on crops, azinphos-ethyl will be removed from the atmosphere by gravitational settling. Vapor-phase azinphos-ethyl will have an atmospheric half-life of 2.2 hr due to its reaction with photochemically-produced hydroxyl radicals(3,SRC).
Drinking Water Impact SURFACE WATER: Azinphos-ethyl was not detected (detection limit 8 parts/trillion) in the northern tract of the Adige River in Northern Italy . It was not detected (<10 parts/trillion) during four samplings from April to August 1988 in the Po River, near Ferrarra, Italy or at two sites in the Adriatic Sea . No azinphos-ethyl was found in water and seston samples in the upper Great Lakes collected in the summer of 1974 . GROUNDWATER: Azinphos-ethyl was not detected in groundwater from 206 wells in a monitoring program conducted in Germany .

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