Chemical Fact Sheet

Chemical Abstract Number (CAS #) 55185
CASRN 55-18-5
Ethanamine, N-ethyl-N-nitroso-
Molecular FormulaC4H10N2O

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

Apparent Color YELLOW LIQUID
Boiling Point 175-177 DEG C
Molecular Weight 102.14
Density 0.9422 at 20 deg C/4 deg C
Environmental Impact Recent information on N-nitrosodiethylamine (DEN) production was not available; however, two producers reported production of < 1000 pounds in 1977. DEN may also form in the environment from the reaction of nitrite with Rhodamine B and Rhodamine WT tracer dyes. DEN has been used as a gasoline and lubricant additive, antioxidant and stabilizer. Because of its low estimated KOC value of 43, DEN is expected to be moderately to highly mobile in soil. Volatilization from soil surfaces will be rapid while volatilization of DEN incorporated into the soil will be slower but may nevertheless be significant. One study reported a DEN half-life in soil of about 3 weeks. The primary fate mechanism for DEN in water may be photolysis. Because of insufficient data, the importance of biodegradation can not be assessed. In water, DEN is not expected to partition to sediments, suspended organic matter, or biota. Volatilization from water will probably not be significant. Hydrolysis is probably not a significant removal process. Estimated atmospheric residence time for DEN is < 0.3 days with photolysis probably the primary removal mechanism. DEN has been found in the air at dye, rubber and foundry industries. DEN has also been found in Philadelphia drinking water, in the passenger area of new cars, in cigarette smoke, and in cheese, bacon, beer and fish. Thus, the general population may be exposed to DEN from riding in new cars, breathing cigarette smoke, drinking beer, or eating certain foods such as cheese, bacon, and fish.
Environmental Fate TERRESTRIAL FATE: The estimated soil adsorption coefficient (Koc) for N-nitrosodiethylamine (DEN) is 43 . This indicates that DEN is moderately to highly mobile in soil . DEN volatilization will probably be rapid from soil surfaces while volatilization of DEN incorporated into the soil will not be as rapid but may be significant. One study found that DEN at a concentration of 18.0 ppm nitroso-N slowly disappeared in soil after a lag of several weeks . DEN seemed to have a half-life of about 3 weeks in the Matapeake loam at 30 deg C . The primary removal mechanisms were volatilization (significant during the first few days)and biodegradation . AQUATIC FATE: N-nitrosodiethylamine (DEN) released to water is expected to stay in solution and not partition to organic matter (Koc = 43 ). The estimated Henry's Law constant for DEN is 1.1X10-8 atm-cu m/mol; therefore, volatilization from water will probably not be significant. Photolysis may be the most significant removal process for DEN since 89% degradation occurs in 7 hours with sunlight . Incubation studies for 108 days in lake water at 30 deg C in the dark indicate that hydrolysis and bioconcentration are not significant processes. ATMOSPHERIC FATE: The half-life for N-nitrosodiethylamine (DEN) was found to be about 1-2 hours in a Teflon outdoor smog chamber irradiated with sunlight . Estimated atmospheric residence time for DEN is <0.3 days with photolysis probably the primary removal mechanism .
Drinking Water Impact DRINKING WATER: Philadelphia tap water contained <0.1-0.7 ng/l N-nitrosodiethylamine . EFFL: Chemical plant effluent released to a river contained 132 ng N-nitrosodiethylamine/l .

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