Chemistry:Lowest-observed-adverse-effect level
The lowest-observed-adverse-effect level (LOAEL), or the lowest-observed-adverse-effect concentration (LOAEC), is the lowest concentration or amount of a substance found by experiment or observation that causes an adverse alteration of morphology, function, capacity, growth, development, or lifespan of a target organism distinguished from normal organisms of the same species under defined conditions of exposure.[1] Federal agencies use set approval standards below this level.
The United States Environmental Protection Agency defines LOAEL as the 'lowest level of a chemical stressor evaluated in a toxicity test that shows harmful effects on a plant or animal. While LOAELs and LOAECs are similar, they are not interchangeable. A LOAEL refers to a dose of chemical that is ingested, while a LOAEC refers to direct exposure to a chemical (e.g., through gills or the skin).[2]
See also
References
- ↑ "IUPAC glossary of terms used in toxicology - terms starting with L". Environmental Health and Toxicology Specialized Information Services. U.S. Department of Health & Human Services. http://sis.nlm.nih.gov/enviro/iupacglossary/glossaryl.html. based upon Duffus, J. H.; Nordberg, M.; Templeton, D. M. (2007). "Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)". Pure and Applied Chemistry 79 (7): 1153. doi:10.1351/pac200779071153.
- ↑ Registries, EPA, OEI, SOR, System Of. "Terms & Acronyms". http://www.epa.gov/OCEPAterms/lterms.html.
This article incorporates public domain material from the Congressional Research Service document "Report for Congress: Agriculture: A Glossary of Terms, Programs, and Laws, 2005 Edition" by Jasper Womach.
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