The AIHA developed an Excel application for mathematical exposure modeling called IHMOD that is very easy to use. One of the models in IHMOD is the purging equation. There are also options available to calculate the generation rate, i.e., the mass per unit time of the chemical evaporating from the spill. There are sliders in IHMOD that allow you to vary the ventilation rate and/or the generation rate (size of the spill) and see the impact of the change. The application is free. IHMOD can be downloaded at the following link:
Past Chair of the Exposure Assessment Strategies Committee, AIHA
James H. Stewart, Ph.D., C.I.H., CSP
Instructor on Occupational Hygiene
Harvard School of Public Health
Exposure, Epidemiology and Risk Program
Landmark Center 4th Floor
Boston, MA 02115
I am looking for a good industrial hygiene resource for calculating the evaporation rates of a spilled chemical and the amount of ventilation required to keep the chemical spill below the specific chemicals OSHA PEL (ppm). Does anyone know of any good computer software programs or calculators?
Lab Safety and Chemical Hygiene Specialist
West Pharmaceutical Services, Inc.
P: +1 610-594-3278
530 Herman O. West Drive | Exton, PA 19341 | United States
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