SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 591082
CASRN 591-08-2
Synonyms1-Acetyl-2-thiourea
Acetamide, N-(aminothioxomethyl)-
Molecular FormulaC3H6N2OS

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

Apparent Color PRISMS FROM WATER; RHOMBIC CRYSTALS FROM ALCOHOL
Melting Point 165 DEG C
Molecular Weight 118.15
Environmental Impact Only limited experimental data are available to predict the environmental fate of 1-acetyl-2-thiourea. A single aqueous hydrolysis study has reported a rate constant corresponding to a half-life of 2.7 hr at pH 9.65. Sufficient data are not available to estimate hydrolysis rates at lower pHs, although the rate at pH 7 is likely to be much slower. 1-Acetyl-2-thiourea absorbs light relatively weakly in the environmental region suggesting a potential for direct photolysis. If released to the atmosphere, 1-acetyl-2-thiourea should degrade rapidly in the vapor-phase (half-life of 4.8 hr estimated from chemical structure) by reaction with photochemically produced hydroxyl radicals. 1-Acetyl-2-thiourea may additionally exist in air in the adsorbed-particulate phase. If released to water, hydrolysis may be important. If released to soil, 1-acetyl-2-thiourea may be susceptible to leaching. Aqueous hydrolysis may be important, particularly in alkaline soils. No data are available regarding biodegradation in soil or water. There are no data available which suggest that the general population is exposed to 1-acetyl-2-thiourea.
Environmental Fate TERRESTRIAL FATE: 1-Acetyl-2-thiourea may be susceptible to significant leaching in soil. Aqueous hydrolysis in moist alkaline soils may be environmentally important, however, the rate at which hydrolysis may occur in the environment cannot be accurately determined for the available data. Since it absorbs UV light above 290 nm, photolysis on sunlit soil surfaces may be possible. No data are available regarding biodegradation. AQUATIC FATE: 1-Acetyl-2-thiourea has been shown to hydrolyze relatively rapidly in water at pH 9.65 (half-life 2.7 hr); however, sufficient data are not available to estimate a half-life at pH 7, although the rate at pH 7 is likely to be much slower. Aquatic volatilization, bioconcentration and adsorption to sediment are not expected to be important. No data are available regarding biodegradation. ATMOSPHERIC FATE: When released to the atmosphere in the vapor-phase, 1-acetyl-2-thiourea will degrade rapidly (estimated half-life of 4.8 hr) by reaction with photochemically produced hydroxyl radicals. However, the vapor pressure of 1-acetyl-2-thiourea may be low enough to permit a significant fraction of the 1-acetyl-2-thiourea released to air to exist in the adsorbed-particulate phase rather than in the vapor-phase. Physical removal from the atmosphere may be possible via wet and dry deposition.

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