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Setting safe acute exposure limits for halon replacement chemicals using physiologically based pharmacokinetic
A Vinegar1, G W Jepson, M Cisneros
1AFRL/HEST, ManTech Environmental Technology, Inc., Wright-Patterson Air Force Base, PO Box 31009, Dayton, OH 45437, USA. allen.vinegar@he.wpafb.af.mil
Inhalation Toxicology
|July 6, 2000
Summary
New fire suppressants, like Halon 1301 replacements, are evaluated for cardiac sensitization risks. Physiologically based pharmacokinetic (PBPK) modeling helps establish safe exposure limits for these critical fire safety chemicals.
Area of Science:
- Environmental Science
- Toxicology
- Chemical Engineering
Background:
- Halogenated hydrocarbons are proposed Halon 1301 replacements for fire suppression.
- Cardiac sensitization is a key toxicological concern for these agents.
- Establishing safe human exposure levels is critical for regulatory approval.
Purpose of the Study:
- To link cardiac sensitization data from dogs to human arterial concentrations.
- To develop a quantitative method for assessing safe exposure limits of fire suppressants.
- To facilitate the selection and safe use of Halon 1301 alternatives.
Main Methods:
- Utilized a physiologically based pharmacokinetic (PBPK) model to link animal and human data.
- Employed Monte Carlo simulations to account for population variability.
- Assessed safe exposure times and concentrations for Halon 1301 and several replacement agents.
Main Results:
- Established a method to translate cardiac sensitization endpoints across species.
- Quantified safe exposure durations for bromotrifluoromethane, trifluoroiodomethane, and HFCs 125, 227ea, and 236fa.
- Demonstrated the utility of PBPK modeling in risk assessment for fire suppressants.
Conclusions:
- PBPK modeling combined with cardiac sensitization data provides a robust approach for safety assessment.
- This quantitative method supports the development of effective standards for Halon replacement chemicals.
- The approach enhances the selection and safe application of next-generation fire suppression agents.