Estimation of inhalation exposure to N-nitrosodipropylamine during the application and incorporation of the herbicide trifluralin

The discovery of N-nitrosodi-N-propylamine (NDPA), a volatile nitrosamine in the herbicide trifluralin, prompted an investigation into the possible exposure of field workers to the contaminant. The potential for inhalation of the nitrosamine during and following herbicide application was evaluated. Personal air monitors were attached to workers during application. Results indicate an extremely low level of exposure potential to ndpa.