Toxicity class
Toxicity Class
Toxicity class (pronunciation: tɒkˈsɪsɪti klɑːs) is a classification system used to indicate the potential harm caused by a chemical substance to an organism. The system is based on the lethal dose of the substance, which is the amount that can cause death in a certain percentage of a population.
Etymology
The term "toxicity" is derived from the Greek word "toxikon," which means "poison," and "class" comes from the Latin "classis," meaning "group" or "division." Thus, "toxicity class" refers to a group or division based on the level of poison.
Classification
The Toxicity class is generally divided into four categories:
- Class I: Extremely toxic substances. These can cause death or permanent injury after very short exposure to small amounts.
- Class II: Highly toxic substances. These can cause death or permanent injury after short exposure to small amounts.
- Class III: Moderately toxic substances. These can cause death or permanent injury after prolonged or repeated exposure to small amounts.
- Class IV: Slightly toxic substances. These can cause death or permanent injury after prolonged or repeated exposure to large amounts.
Related Terms
- Acute toxicity: The harmful effects of a substance that result either from a single exposure or from multiple exposures in a short period.
- Chronic toxicity: The harmful effects of a substance that occur after or are the result of long-term exposure.
- Lethal dose: The amount of a substance that is sufficient to cause death in an organism.
- Toxicology: The study of the effects, detection, and treatment of poisons.
External links
- Medical encyclopedia article on Toxicity class
- Wikipedia's article - Toxicity class
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