Pesticide exposure during greenhouse applications. III. Variable exposure due to ventilation conditions and spray pressure.
Methner MM; Fenske RA
Appl Occup Environ Hyg 1996 Mar; 11(3):174-180
The effectiveness of ventilation systems and application pressures in greenhouses was evaluated for their ability to protect workers from dermal and respiratory exposure to pesticides. Six workers were monitored with patch techniques and sampling of air during greenhouse gunning applications. Two application pressures (40 and 120 pounds/square inch) and three ventilation conditions (low velocity unidirectional, multidirectional, and no ventilation) were examined. A fluorescent whitening agent tracer was used as a surrogate for pesticides. Results clearly showed that an interaction between application pressure and ventilation condition occur during greenhouse handgunning applications. Mean total body, back, upper arm, and forearm dermal deposition rates increased significantly when application pressure was increased under unidirectional ventilation. The total body rate decreased significantly under multidirectional ventilation when application pressure increased. Tracer deposition rates during low pressure, unidirectional applications were significantly less than low pressure, no ventilation applications for all regions except the chest, upper legs, and lower legs. Deposition rates during multidirectional ventilation were significantly greater than the other ventilation conditions at either pressure except for the back at high pressure. At both application pressures, breathing zone contamination under unidirectional and multidirectional ventilation was three and four fold lower, respectively, than under no ventilation. Unidirectional ventilation reduced dermal and breathing zone contamination, whereas multidirectional ventilation increased dermal exposure but reduced breathing zone contamination. The authors conclude that careful characterization of both dermal and respiratory exposure is needed during greenhouse handgunning applications.
NIOSH-Publication; NIOSH-Grant; Grants-other; Skin-exposure; Air-sampling; Pesticide-residues; Gardeners; Ventilation-systems; Ventilation-equipment; Exhaust-ventilation
Environmental Sciences Rutgers University P O Box 231, Cook College New Brunswick, N J 08903
Other Occupational Concerns; Grants-other
Applied Occupational and Environmental Hygiene
Rutgers the State Univ New Brunswick, New Brunswick, New Jersey