|Chemical Abstract Number (CAS #)||
||EPA Method 607||EPA Method 625
||EPA Method 8070
||EPA Method 8270
Link to the National Library of Medicine's Hazardous Substances
Database for more details
on this compound.
|Use|| N-nitroso compounds are produced primarily as research chemicals and not for
commercial purposes. N-Nitroso compounds
|Apparent Color|| YELLOW LIQUID
|Molecular Weight|| 130.22
|Density|| 0.9160 @ 20 DEG C/4 DEG C
|Environmental Impact|| N-nitrosodi-n-propylamine (DPN) is apparently not commercially produced in any
significant quantity but has been found as a contaminant in the substituted dinitrotrifluarin
herbicides and has been detected in effluent from a textile plant. If released to the surface of soils,
DPN will rapidly volatilize. In soil, DPN is not expected to sorb strongly to organic matter and
thus may leach into groundwater. In general, DPN is not expected to be persistent in soils because
of removal by volatilization and biodegradation. If released to water, DPN will have a slight
tendency to sorb to suspended organic matter, biota, and sediments. Bioconcentration will not be
significant. Volatilization of DPN from water will probably not be significant except possibly from
shallow rivers. Photolysis may be the most important degradative process for DPN in water. The
rate of biodegradation cannot be assessed and hydrolysis is probably not important. In the
atmosphere, DPN probably will rapidly photolyze. DPN has been found in wastewater, secondary
effluent from textile plants, in soils treated with the herbicide trifluralin, in the breathing zone of
workers mixing and applying trifluralin, and in cooked fish.
|Environmental Fate|| TERRESTRIAL FATE: N-nitrosodi-n-propylamine (DPN) released to the surface of
soils will rapidly volatilize(1,2). DPN half-life in aerobic soils under laboratory conditions was
about 3 weeks with volatilization and biodegradation the primary removal processes . In a field
dissipation study DPN half-lives were approximately 21 and 40 days in sandy loam and silty clay
loam soils, respectively . Thus, DPN will probably not be persistent in aerobic soils. The low
estimated soil adsorption coefficient (Koc) for DPN indicates that it will probably not adsorb to
organic matter and will thus be mobile in soil. No information was found on hydrolysis in soil;
however, one study reported that DPN concentrations in lake water essentially did not change
after 108 days incubation at 30 deg C in the dark . In another study, DPN was also shown to be
resistent to hydrolysis in aqueous solutions(6). Thus, hydrolysis is probably not an important
degradative mechanism for DPN in soil.
AQUATIC FATE: In water, N-nitrosodi-n-propylamine (DPN) will have a slight tendency to
sorb to sediments, suspended organic matter, and biota. Volatilization of DPN from water will
probably not be significant except possibly from shallow rivers. Photolysis may be the most
important degradative process for DPN in water (90% degradation in 8 hours ). The major
photoproduct is n-propylamine and di-n-propylamine is also formed . Although the data are
inconsistent, biodegradation may also be an important degradative process for DPN. Hydrolysis is
apparently not a significant removal process for DPN(1,2,SRC).
ATMOSPHERIC FATE: Based on experimental data, N-nitrosodi-n-propylamine (DPN)
probably will rapidly photolyze in the atmosphere . The major photoproduct is n-propylamine;
di-n-propylamine is also formed. A computer estimated half-life for DPN in reaction with
hydroxyl radicals in the atmosphere is 4.03 days .
EFFL: REPORTED TO OCCUR IN WASTEWATER FROM 3/18 CHEMICAL
FACTORIES AT LEVELS OF 0.12 & 2.8 UG/L.
N-nitrosodi-n-propylamine concentration in wastewater was 0-5 ug/l and 2-20 mg/cu m in the
secondary effluent from textile plants .
Significant concentrations of nitrosamines have been reported for a limited number of samples of
ocean water, river water, and waste treatment plant effluent adjacent to or receiving wastewater
from industries using nitrosamines or secondary amines in production operations. Nitrosamines/