What does Chemical persistent mean?
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What does Chemical persistent mean?
Persistent chemicals are those chemicals that tend to endure in the environment for years after they are released into it. It takes longer to remove them from the environment after their use is over. Examples of persistent chemicals are chlorinated hydrocarbons such as aldrin and lindane.
What are bio persistent chemicals?
Persistent bioaccumulative toxic substances (PBTs) are chemicals that do not degrade easily in the environment. PBTs typically accumulate in fatty tissues and are slowly metabolized, often increasing in concentration within the food chain.
What are persistent pollutants give an example?
Types of persistent organic pollutants (POPs) include intentionally produced chemicals such as pesticides aldrin, chlordane, DDT (1,1,1-Trichloro-2,2-bis[p-chlorophenyl]-ethane), dieldrin, endrin, heptachlor, mirex, hexachlorobenzene (HCB), and toxaphene as well as industrial chemicals such as polychlorinated biphenyls …
What is meant by persistent organic pollutants?
Persistent organic pollutants (POPs) are toxic chemicals that adversely affect human health and the environment around the world. Because they can be transported by wind and water, most POPs generated in one country can and do affect people and wildlife far from where they are used and released.
What are persistent and non persistent pollutants?
The terms persistent and non-persistent refer to how long a pesticide stays in the environment. Non-persistent pesticides break down in the environment more quickly than persistent pesticides. Persistent pesticides have a greater potential to accumulate in organisms.
What is a persistent pesticide?
What are persistent pesticides? Persistent pesticides, which primarily consist of organochlorine pesticides, are considered persistent because they are stable in the environment and resist being broken down. The organochlorine DDT also was used to control typhus and malaria.
Persistent Organic Pollutants (POPs) are toxic substances composed of organic (carbon-based) chemical compounds and mixtures. They include industrial chemicals like PCBs and pesticides like DDT. They are primarily products and by-products from industrial processes, chemical manufacturing and resulting wastes.
What is an example of a persistent organic pollutant?
Examples of persistent organic pollutants include:
- Aldrin.
- Chlordane.
- DDT.
- Dieldrin.
- Endrin.
- Heptachlor.
- Hexachlorobenzene.
- Mirex.
What is persistence in environmental science?
Persistence is usually described as the half-life (T ½) of a chemical in water, soil, sediment, or air. The T ½ is the amount of time necessary for a given amount of chemical released into the environment to decrease to one-half of its initial value.