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Station. This paper reports the results of research only. Mention of an insecticide or proprietary product does not constitute a recommendation or an endorsement by Kansas State University.

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The discovery of JV-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 application of the herbicide was evaluated. Experiments were conducted in which personal air monitors were attached to workers while applying herbicide containing 2-6 ppm of NDPA. To more closely approximate the inhalation rate of field workers, additional experiments were conducted with high-volume pumps mounted on tractors and placed in treated fields. Sampling and analytical techniques are described. The results of these experiments demonstrated an extremely low level of exposure potential.