Abstract:
:To meet the military objective of determining criteria for incapacitation and lethality from toxic gas exposures, a series of small animal tests and data analyses were conducted. Carbon monoxide (CO), a narcotic gas and nitrogen dioxide (NO2), an irritant gas, along with carbon dioxide (CO2) were tested individually and in the following mixtures: (CO + CO2), (NO2 + CO2) and (NO2 + CO + CO2). A group of six animals was exposed to each of the gases and their combinations, lethality and biophysical data were collected. We conclude that our observations of lethality from single toxic gases can be correlated with a fractional effective dose (FED) description, in which external concentrations are corrected for minute volume changes. Multiple gas exposures clearly demonstrate synergistic effects because lethality rates greatly exceed those expected from statistically independent causes. Simple addition of the FED values, however, overstates the effect and implies a competition between the narcotic and irritant gas effects. The N-Gas model, while being an additive FED model, does not appear to be in a form that could guide the setting of military exposure standards.
journal_name
Toxicologyjournal_title
Toxicologyauthors
Smith SM,Stuhmiller JH,Januszkiewicz AJdoi
10.1016/s0300-483x(96)03504-4subject
Has Abstractpub_date
1996-12-31 00:00:00pages
157-65issue
1-3eissn
0300-483Xissn
1879-3185pii
S0300-483X(96)03504-4journal_volume
115pub_type
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