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NewsWe are please to announce the the following staff members will be speaking at the 2007 AIHACE.
John W. Spencer
Marc J. Plisko
Dale Johnson
Mark Nealley
EPI would like to recognize Mark Nealley, MS, CIH for his co-presentation of "Comparison of EPA's Human Health Risk Assessment Protocol: 1998 and 2005" at the Hazardous Waste Combuster's Conference in Charleston, South Carolina on 13 March 2007. His co-author was Suellen Pirages.
EPI would like to recognize Bruce Lippy, PhD for his presentation of
"Nanotechnology: Hazard Communication Issues" at the 2006
National Response Team Worker Safety and Health Technical Conference in Washington,
D.C.
"A COMPARISON STUDY USING A MATHEMATICAL MODEL AND ACTUAL
EXPOSURE MONITORING FOR ESTIMATING SOLVENT EXPOSURES DURING THE DISASSEMBLY
OF METAL PARTS" , a paper by Marc Plisko and John Spencer
has been published in the April 2007 issue of the AIHA's Journal of Occupational
and Environmental Hygiene, Volume 4 Number 4.
ASBTRACT
The objective of this research was to compare the airborne solvent concentrations
measured during the disassembly of solvent-coated metal parts with concentrations
predicted by a mathematical model. The study involved three test simulations
where cyclohexane, used as a penetrating solvent, was squirted onto a gate
valve while the valve was subsequently disassembled. Three test simulations
were performed in order to evaluate the effect of varying the speed of random
air movement in the work area. For statistical considerations, six replicate
solvent application trials were conducted for each simulation. Area and personal
air samples were collected during the trials performed under each test simulation.
Cyclohexane was applied to the valve at a consistent rate in order to obtain,
to the greatest extent possible, a constant generation rate of solvent vapors.
The Near Field-Far Field (NF-FF) model, applied using a constant solvent generation
rate, was selected to predict the solvent vapor concentrations, and Monte
Carlo analysis was used to quantify uncertainty in the input parameters of
the model. Solvent concentration predictions obtained from the modeling process
were within a multiplicative factor of 0.1 to 1.5 of the arithmetic mean of
the actual air sample results for all three NF and FF conditions in each simulation.
Application of the NF-FF model under the conditions described suggests there
is a reasonable degree of reliability in forecasting airborne contaminant
levels in the workplace environment. Given the limited resources faced today
by many industrial hygienists, exposure modeling can serve as a valuable tool
for generating the information needed to make informed decisions about employee
exposure.
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