SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 120718
CASRN 120-71-8
Synonymsp-Cresidine
o-Anisidine, 5-methyl
2-Methoxy-5-methylaniline
Molecular FormulaC8H11NO

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

Use DYES CHEM INT FOR DYES (EG, FD&C RED 40 & DIRECT VIOLET 9)
Consumption Patterns ESSENTIALLY 100% AS A CHEMICAL INTERMEDIATE FOR DYES
Apparent Color WHITE CRYSTALS
Boiling Point 235 DEG C
Melting Point 51.5 DEG C
Molecular Weight 137.2
Environmental Impact p-Cresidine is an anthropogenic compound which is used as a synthetic intermediate in dye manufacturing. If released to soil, p-cresidine may slowly volatilize from both moist and dry soil to the atmosphere. It may display high mobility in soil; however, the amino group of p-cresidine may bind covalently with active sites in soil greatly limiting its mobility. Based on limited data, p-cresidine is likely to only slowly biodegrade in soil. If released to water, p-cresidine may slowly volatilize to the atmosphere. The estimated half-lives for volatilization from a model river range from 23-346 days. By analogy to other aromatic amines, p-cresidine is expected to exist predominately in the ionized form in water which will attenuate the rate of this process. p-Cresidine is not expected to bioconcentrate in fish and aquatic organisms. Based on limited data, p-cresidine is expected to only slowly biodegrade in water. If released to the atmosphere, p-cresidine is expected to undergo a rapid gas-phase reaction with photochemically produced hydroxyl radicals with an estimated half-life of 1.8 hrs. Occupational exposure to p-cresidine may occur by dermal contact during its production or use.
Environmental Fate TERRESTRIAL FATE: If released to soil, estimated Henry's Law constants for p-cresidine ranging from 3.9X10-7 atm-cu m/mole at 25 deg C(1-2,SRC) to 1.9X10-6 atm-cu m/mole at 25 deg C(3,SRC), and its estimated vapor pressure, 1.02X10-2 mm Hg at 25 deg C(2,SRC), indicate that it is expected to slowly volatilize from both moist and dry soil to the atmosphere. Estimated soil adsorption coefficients ranging from 42 to 192(1-2,SRC) indicate that it may display high mobility in soil ; however, the amino group of p-cresidine may bind covalently with active sites in soil greatly limiting its mobility(5,SRC). Based on limited data, p-cresidine is likely to only slowly biodegrade in soil(6). AQUATIC FATE: If released to water, estimated Henry's Law constants for p-cresidine ranging from 3.9X10-7 atm-cu m/mole at 25 deg C(1-2,SRC) to 1.9X10-6 atm-cu m/mole at 25 deg C(3,SRC) indicate that it may slowly volatilize from water to the atmosphere. The estimated half-lives for volatilization from a model river 1 m deep flowing at 1 m/sec with a wind speed of 3 m/sec range from 23 to 346 days(1,SRC). By analogy to other aromatic amines , p-cresidine is expected to exist predominately in the ionized form in water which will further attenuate the rate of this process. Estimated bioconcentration factors ranging from 5 to 11(1-2,SRC) and <100 indicate that it will not bioconcentrate in fish and aquatic organisms. Based on limited data, p-cresidine is expected to only slowly biodegrade in water(6). ATMOSPHERIC FATE: If released to the atmosphere, p-cresidine is expected to undergo a rapid gas-phase reaction with photochemically produced hydroxyl radicals. Based on an estimated rate constant of 2.21X10-10 cu cm/molec-sec(1,SRC) an atmospheric half-life of 1.8 hrs can be calculated for this process.

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