Occurrence of part per million levels of N-nitrosodi-n-propylamine in various dinitroaniline herbicides may result in release of small amounts of the nitrosamine into the atmosphere during and after application

N-nitrosodi-n-propylamine is not an industrially or commercially important chemical. It is produced in small, laboratory-scale quantities for research purposes. It is also produced inadvertently during certain manufacturing processes, occurring as an impurity in some dinitroaniline pesticides and during manufacture of some extruded rubber products. Nitrosodi­ n-propylamine could also be present in certain secondary amines (di-n-propylamine, tri-n-propylamine and the N-oxide of tri-n-propylamine) as an impurity or due to inadvertent nitrosation of these amines in industrial processes other than those mentioned above. Low levels of Nitrosodi-n­ propylamine may be released to the environment from contaminated products, from industrial sites of inadvertent production or from disposal of wastes containing this chemical. N-nitrosodi-n-propylamine could also be released to the environment from waste disposal sites where the precursor secondary amines have been discharged, but the potential for human exposure from nitrosation of precursors at waste sites has not been evaluated.