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| Latency Period |
| | The period of time between an exposure and onset of toxicity. |
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| LC0 |
| | Lethal Concentration 0% The calculated concentration of a gas at which none of the population is expected to die. |
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| LC10 |
| | Lethal Concentration 10%. The calculated concentration of a gas at which 10% of the population is expected to die. |
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| LC50 |
| | Lethal Concentration 50%. The calculated concentration of a gas at which 50% of the population is expected to die. |
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| LC90 |
| | Lethal Concentration 90%. The calculated concentration of a gas at which 90% of the population is expected to die. |
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| LD0 |
| | Lethal Dose 0%. The estimated dose at which none of the population is expected to die. |
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| LD10 |
| | Lethal Dose 10%. The estimated dose at which 10% of the population is expected to die. |
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| LD50 |
| | Lethal Dose 50%. The estimated dose at which 50% of the population is expected to die. |
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| LD90 |
| | Lethal Dose 90%. The estimated dose at which 90% of the population is expected to die. |
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| Linearized Multistage Model |
| | A conservative quantitative cancer assessment model used by the EPA. It assumes linear extrapolation with a zero dose threshold from the upper confidence level of the lowest dose that produced cancer in an animal test or in a human
epidemiology study. |
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| Lipid Soluble |
| | Capable of being dissolved in fat or in solvents that dissolve fat. Usually non-ionized compounds. |
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| LOAEL |
| | Lowest Observed Adverse Effect Level. The lowest dose in a study in which there was an observed toxic or adverse effect. |
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